Story
Blood work decoded · routine chemistry
Last updated
In one pass The easiest mistake with a lab report is panicking at a single arrow.
Educational content, not medical advice — consult a clinician.
Story path
Chapter 1
Arrows are not verdicts
The easiest mistake with a lab report is panicking at a single arrow. One arrow is not a verdict, and three things decide how to read it.
First, a reference range is not a healthy range. The "normal" interval printed on the report is usually the middle 95% of a reference group. It tells you whether your value is unusual compared with that group; it does not directly tell you how much risk you carry.
Second, a single arrow says little; the pattern is what matters. a little high, "good" cholesterol a little low, liver enzymes a little high, uric acid a little high, fasting insulin on the high side: none of these on its own counts as a disease. But when they show up together, they often point to one upstream problem: insulin resistance, in which cells respond less to insulin.
Third, trends beat snapshots. A single result is swayed by sleep, stress, diet, the menstrual cycle and medication. The direction of several results from the same lab, under the same fasting conditions, is far more reliable than one isolated number.
Some values cannot wait for lifestyle change. Very high blood glucose (especially with thirst, frequent urination or confusion), or potassium or sodium far out of range, means going to the emergency department the same day. The full list is in Urgent results in a routine panel.
First, a reference range is not a healthy range. The "normal" interval printed on the report is usually the middle 95% of a reference group. It tells you whether your value is unusual compared with that group; it does not directly tell you how much risk you carry.
Second, a single arrow says little; the pattern is what matters. a little high, "good" cholesterol a little low, liver enzymes a little high, uric acid a little high, fasting insulin on the high side: none of these on its own counts as a disease. But when they show up together, they often point to one upstream problem: insulin resistance, in which cells respond less to insulin.
Third, trends beat snapshots. A single result is swayed by sleep, stress, diet, the menstrual cycle and medication. The direction of several results from the same lab, under the same fasting conditions, is far more reliable than one isolated number.
Some values cannot wait for lifestyle change. Very high blood glucose (especially with thirst, frequent urination or confusion), or potassium or sodium far out of range, means going to the emergency department the same day. The full list is in Urgent results in a routine panel.
Background · How a reference range is set
Take fasting insulin. Many labs print 2–25 µU/mL as normal, yet metabolically healthy people tend to sit at 2–8. A value of 18 is inside the reference range and may already point to insulin resistance.The reason lies in how a reference interval is built. Line up a reference group, trim the lowest 2.5% and the highest 2.5%, and call the middle 95% "normal". The reference group is usually screened for known disease, but insulin resistance without symptoms does not show up in that kind of screening. So the interval answers whether you are unusual compared with that reference group, not how much risk you carry; and when a sizeable share of the group is itself insulin-resistant, they stretch the upper bound wide.
That is why every group in this story gives two numbers: the reference value (what the lab prints) and the optimal value (where metabolically healthy people tend to sit). The optimal value is not a diagnostic standard. A result inside the reference range but outside the optimal band is a prompt to pay attention and to read it alongside your other markers and their trend; whether to act is a decision to make with your doctor. This matters most for fasting insulin and (an estimate of insulin resistance calculated from fasting glucose and fasting insulin), which have no agreed diagnostic cut-off and vary a lot between labs.
This story reads routine chemistry in four groups: lipids, glucose metabolism, liver enzymes, and kidney function plus uric acid. Each group covers reference and optimal values, what an arrow means, what nutrition can do, and when you must see a doctor. Many results, one root cause then ties all the arrows together — they are often different faces of the same problem.
Chapter 2
Why lipid particle count matters
Cholesterol does not dissolve in water, and blood is mostly water. So cholesterol cannot float through the blood on its own; it has to travel packed inside small spheres called lipoproteins. The , and lines on your report (low-density lipoprotein cholesterol, high-density lipoprotein cholesterol and triglycerides) are really measuring these spheres and the cargo they carry.
The key point: what lodges in the artery wall is the sphere itself, not the cargo. Every particle that can drive atherosclerosis carries exactly one protein on its surface. A particle slips under the inner lining of the artery, gets stuck and is swallowed by immune cells, and that is how plaque forms. So what really needs counting is how many particles there are.
This is why LDL-C can mislead. The same amount of cholesterol can travel in a few large particles or in many small, dense ones. The second case means more particles and higher risk, yet the LDL-C number cannot tell the two apart. People with high triglycerides, diabetes or obesity are especially prone to this mismatch, and for them ApoB is more accurate than LDL-C.
When to see a doctor: LDL-C ≥ 4.9 mmol/L (190 mg/dL) calls for screening for familial hypercholesterolemia (an inherited cause of very high cholesterol); TG > 5.6 mmol/L (500 mg/dL) calls for steps to prevent pancreatitis; people who already have cardiovascular disease and are not at their LDL-C goal need their medication adjusted.
The key point: what lodges in the artery wall is the sphere itself, not the cargo. Every particle that can drive atherosclerosis carries exactly one protein on its surface. A particle slips under the inner lining of the artery, gets stuck and is swallowed by immune cells, and that is how plaque forms. So what really needs counting is how many particles there are.
This is why LDL-C can mislead. The same amount of cholesterol can travel in a few large particles or in many small, dense ones. The second case means more particles and higher risk, yet the LDL-C number cannot tell the two apart. People with high triglycerides, diabetes or obesity are especially prone to this mismatch, and for them ApoB is more accurate than LDL-C.
When to see a doctor: LDL-C ≥ 4.9 mmol/L (190 mg/dL) calls for screening for familial hypercholesterolemia (an inherited cause of very high cholesterol); TG > 5.6 mmol/L (500 mg/dL) calls for steps to prevent pancreatitis; people who already have cardiovascular disease and are not at their LDL-C goal need their medication adjusted.
Numbers · Reading the lipid panel line by line
Total cholesterol (TC): < 5.2 mmol/L (200 mg/dL) is desirable. But it carries the least information: it adds the good and the bad together, so it cannot show risk. Someone with a very high can have a raised TC and be perfectly healthy.(low-density lipoprotein cholesterol, the so-called "bad" cholesterol): this is the treatment target, but how to read it depends on your risk tier. Under the ESC guideline the goals are < 3.0 at low risk, < 2.6 at moderate risk, < 1.8 at high risk and < 1.4 mmol/L at very high risk. The same 3.5 means something completely different in a healthy 30-year-old and in someone who has had a heart attack.
HDL-C (high-density lipoprotein cholesterol, the so-called "good" cholesterol): men > 1.0, women > 1.3 mmol/L (40/50 mg/dL). But note that in large randomized trials, a drug that raised HDL-C (torcetrapib, for example) did not reduce cardiovascular events. That suggests HDL-C is more a marker of risk than a cause. Low HDL-C together with high is the classic sign of insulin resistance.
Triglycerides (TG): < 1.7 mmol/L (150 mg/dL) is desirable; > 5.6 (500 mg/dL) carries a risk of pancreatitis. TG is a sensitive metabolic marker: it reflects how the liver responds to insulin.
Non-high-density lipoprotein cholesterol (non-HDL-C): TC minus HDL-C, which covers every particle that can drive atherosclerosis. Under the ESC guideline its goal sits about 0.8 mmol/L (30 mg/dL) above the LDL-C goal.
: a direct count of the particles that can drive atherosclerosis, one ApoB per particle. < 90 mg/dL is low risk, 90–109 borderline, ≥ 110 high. In people with high triglycerides, diabetes or obesity, ApoB is more accurate than LDL-C.
(lipoprotein(a)): > 50 mg/dL (125 nmol/L) counts as raised. It is mostly set by your genes and barely moves with diet or exercise; the ESC guideline advises considering a measurement at least once in every adult's lifetime. A high Lp(a) is an independent risk factor for cardiovascular disease and for aortic stenosis, a narrowing of the heart's main outflow valve.
Nutrition levers: swap saturated fat for unsaturated fat (LDL-C down about 10%); soluble fiber 5–10 g/day (oats, legumes); plant sterols 2 g/day; weight loss of 5–10% (TG down 20–30%); cut back on sugar and alcohol (TG falls fastest); Fish Oil 2–4 g/day (TG down 25–40%, a prescription-level dose). Realistically, diet changes LDL-C by about 10–15%; it is not a cure-all. The Dyslipidemia story covers treatment goals and medication in full.
In practice · A no-cost screen for insulin resistance
If your checkup only has the standard four lipid lines (total cholesterol, , , ) and no insulin or , there is a free stand-in: the ratio of triglycerides (TG) to high-density lipoprotein cholesterol (HDL-C), called the TG/HDL ratio.How to calculate it: divide TG (mg/dL) by HDL-C (mg/dL); the cut-offs below are for this ratio. If your report only gives mmol/L, divide TG (mmol/L) by HDL-C (mmol/L) and then multiply by 2.29 (the two lipids convert from mmol/L to mg/dL with different factors) before comparing with the cut-offs. The raw mmol/L ratio comes out at less than half the true value and would miss insulin resistance.
Men > 2.8 and women > 2.53 suggest insulin resistance.A systematic review of 32 studies and nearly 50,000 people compared the ratio against and found a good correlation; how accurate the cut-offs are varies with ethnicity and sex.The ratio also hints at an excess of small, dense low-density lipoprotein particles (sdLDL), which are more likely to drive atherosclerosis.
Caveat: the ratio is less reliable in people of African descent (who often have low triglycerides but can still be insulin-resistant), and in Asian populations the cut-offs may be lower.
So next time you read a report, work out the TG/HDL ratio first. If it is high, even with a normal LDL-C, it is worth asking your doctor about checking fasting insulin and HOMA-IR.
Chapter 3
Why check insulin, not just glucose
As glucose metabolism goes wrong, fasting blood glucose is usually the last number to change.
You eat carbohydrate, blood glucose rises, and the pancreas releases insulin. Insulin reaches the doors of muscle and fat cells and tells them to open and take in glucose. Trouble starts when those cells begin playing deaf: the same amount of insulin knocks, but fewer doors open. That is insulin resistance.
The pancreas does not give up; it turns up the volume, releasing more insulin to force blood glucose back into the normal range. This compensation phase can last 5–15 years. Throughout it, fasting glucose is perfectly normal while fasting insulin quietly climbs.
So checking glucose without insulin is like a smoke alarm that only goes off once the house is already burning. , calculated by combining the two numbers, is one of the few signals visible during this compensation phase; the ratio of to "good" cholesterol is another.
When to see a doctor: a fasting glucose ≥ 7.0 mmol/L or an ≥ 6.5% reaches the diagnostic cut-off for diabetes and needs a repeat test with your doctor to confirm it; a fasting glucose of 100–125 mg/dL or an HbA1c of 5.7–6.4% is prediabetes and calls for a 75 g (OGTT) for further assessment; a HOMA-IR > 3.0 with a waist over 90 cm in men or 80 cm in women calls for a doctor's assessment for metabolic syndrome.
You eat carbohydrate, blood glucose rises, and the pancreas releases insulin. Insulin reaches the doors of muscle and fat cells and tells them to open and take in glucose. Trouble starts when those cells begin playing deaf: the same amount of insulin knocks, but fewer doors open. That is insulin resistance.
The pancreas does not give up; it turns up the volume, releasing more insulin to force blood glucose back into the normal range. This compensation phase can last 5–15 years. Throughout it, fasting glucose is perfectly normal while fasting insulin quietly climbs.
So checking glucose without insulin is like a smoke alarm that only goes off once the house is already burning. , calculated by combining the two numbers, is one of the few signals visible during this compensation phase; the ratio of to "good" cholesterol is another.
When to see a doctor: a fasting glucose ≥ 7.0 mmol/L or an ≥ 6.5% reaches the diagnostic cut-off for diabetes and needs a repeat test with your doctor to confirm it; a fasting glucose of 100–125 mg/dL or an HbA1c of 5.7–6.4% is prediabetes and calls for a 75 g (OGTT) for further assessment; a HOMA-IR > 3.0 with a waist over 90 cm in men or 80 cm in women calls for a doctor's assessment for metabolic syndrome.
Numbers · Reading the glucose and insulin values
Fasting glucose: 3.9–5.5 mmol/L (70–99 mg/dL) is normal; 5.6–6.9 (100–125) is prediabetes; ≥ 7.0 (126) is diabetes. These are the American Diabetes Association (ADA) cut-offs; countries do not all set the lower bound of prediabetes in the same place.Fasting insulin: the earliest marker to move. Metabolically healthy people usually sit at 2–8 µU/mL. Many labs list up to 25 as normal, partly because their reference group itself includes a good number of insulin-resistant people. Insulin > 10–12 deserves attention, especially alongside raised .
= insulin (µU/mL) × glucose (mg/dL) ÷ 405 (or ÷ 22.5 if glucose is in mmol/L). It is a formula that estimates insulin resistance from fasting glucose and fasting insulin, and it has no guideline-endorsed diagnostic cut-off: fasting-insulin assays differ between labs, and the cut-offs studies use to flag insulin resistance shift with age, sex and population. The higher the number, the more likely insulin resistance is. A high value is a reason to talk to your doctor and read it alongside glucose and lipids, not grounds for a self-diagnosis.
Studies have reported that Chinese and South Asian populations develop metabolic problems at lower HOMA-IR values (1.4–1.78), so cut-offs set in other populations cannot simply be carried over.
(glycated hemoglobin): reflects average blood glucose over the past 2–3 months. < 5.7% is normal; 5.7–6.4% is prediabetes; ≥ 6.5% is diabetes. Caveat: iron-deficiency anemia can make HbA1c read falsely high, and hemolysis (red blood cells breaking apart) or blood loss can make it read falsely low.
Nutrition levers: cut back on refined carbohydrate and added sugar; at each meal, eat protein and vegetables before the carbohydrate (in a small crossover trial in people with diabetes, eating in this order lowered post-meal glucose by about 30–40%); strength training, which makes muscle take up more glucose and is a powerful non-drug tool; a 10–15-minute walk after meals; 7–9 hours of sleep; weight loss of 5–10%. Time-restricted eating (, with a 14–16-hour overnight fast) has some supporting evidence. Berberine, 500 mg three times a day, improved HOMA-IR in randomized trials, but it is a supplement and cannot replace lifestyle change.
Athlete caveat: after heavy training, fasting glucose can be mildly raised (100–110 mg/dL). By the mechanism, this is a physiological response in which the liver releases glucose into the blood. If fasting insulin stays low (2–4), that response is the likelier explanation rather than worsening metabolism. But by definition this glucose still falls in the prediabetes range, so recheck at a time away from heavy training to confirm.
idf-2006-metabolic-syndrome-definition
Numbers · What a report looks like during compensation
During compensation, a lab report can look like this:Fasting glucose perfectly normal (90–99 mg/dL) perfectly normal (< 5.5%)Yet fasting insulin already at 12–18 µU/mL already at 2.5–4.0 starting to rise, "good" cholesterol starting to fall, mildly raised, uric acid up, waist growing
When muscle, liver and fat cells respond less to insulin, the β-cells of the pancreas secrete more insulin and force blood glucose back into the normal range; this stretch can last 5–15 years. So a routine checkup that measures fasting glucose but not insulin will miss a great deal of early metabolic trouble.
A typical example: a fasting glucose of 92 mg/dL (perfectly normal) and a fasting insulin of 15 µU/mL give a HOMA-IR of 3.4, above the cut-offs studies commonly use to flag insulin resistance. Read on glucose alone, this report says "you're fine", yet metabolism is already sliding.
That is why HOMA-IR and the ratio of triglycerides to "good" cholesterol (TG/) are worth reading first: during a compensation phase that can last 5–15 years they may move early, while fasting glucose moves only once compensation can no longer hold.
Chapter 4
What raised liver enzymes mean
The enzymes on a liver panel are not liver function itself; they are what leaks out when liver cells are injured. Once you see that, it is clear why a mild rise in and does not equal hepatitis.
Picture each liver cell as a bag full of enzymes. While the cell is intact, the enzymes stay inside. When the cell is stretched, poisoned or stuffed with fat, the bag seeps and the enzymes escape into the blood. So more enzyme in the blood means more cells are leaking right now, not that the liver's capacity to work has fallen.
What really reports that capacity is what the liver makes (albumin, clotting factors) and what it clears (bilirubin). That is also why someone with advanced cirrhosis can have transaminases that are not high: few cells are left to leak.
One of the commonest causes of a mild rise is fatty liver: liver cells swollen with have leaky membranes. So the liver-enzyme lines are often downstream of the glucose-metabolism group. Other causes, such as viral hepatitis, medication and alcohol, need to be ruled out by a doctor.
When to see a doctor: ALT or AST > 1000; jaundice (yellowing of the whites of the eyes or of the skin); fluid in the abdomen (ascites), or red palms or spider-like blood vessels on the skin; in someone with known liver disease, falling albumin or bilirubin that keeps rising.
Picture each liver cell as a bag full of enzymes. While the cell is intact, the enzymes stay inside. When the cell is stretched, poisoned or stuffed with fat, the bag seeps and the enzymes escape into the blood. So more enzyme in the blood means more cells are leaking right now, not that the liver's capacity to work has fallen.
What really reports that capacity is what the liver makes (albumin, clotting factors) and what it clears (bilirubin). That is also why someone with advanced cirrhosis can have transaminases that are not high: few cells are left to leak.
One of the commonest causes of a mild rise is fatty liver: liver cells swollen with have leaky membranes. So the liver-enzyme lines are often downstream of the glucose-metabolism group. Other causes, such as viral hepatitis, medication and alcohol, need to be ruled out by a doctor.
When to see a doctor: ALT or AST > 1000; jaundice (yellowing of the whites of the eyes or of the skin); fluid in the abdomen (ascites), or red palms or spider-like blood vessels on the skin; in someone with known liver disease, falling albumin or bilirubin that keeps rising.
Numbers · Each liver enzyme and its range
(alanine aminotransferase): found mainly in liver cells, and the most liver-specific marker of injury. Lab ranges are roughly 7–56 U/L for men and 7–30 U/L for women, but from a metabolic point of view, men > 35 and women > 25 deserve attention; this can be one of the earliest signs of fatty liver. That kind of fatty liver is now called metabolic dysfunction-associated steatotic liver disease, or (formerly NAFLD). ALT > 1000 suggests acute liver injury (from a virus, a drug or a lost blood supply) and needs the emergency department.(aspartate aminotransferase): found in the liver, heart, muscle and red blood cells. An AST/ALT ratio > 2:1 suggests alcohol-related liver disease; AST raised on its own with a normal ALT points to muscle injury (after a hard leg workout, for example) or a heart problem.
(gamma-glutamyl transferase): linked to the bile ducts and to alcohol. Men 0–71, women 6–42 U/L. The commonest causes of a raised GGT are alcohol (even modest amounts), fatty liver and bile-duct problems. In observational studies it also predicts metabolic syndrome independently.
ALP (alkaline phosphatase): comes from the bile ducts and from bone. 44–147 U/L. ALP and GGT raised together usually point to the bile ducts; ALP raised alone suggests faster bone turnover (children, pregnancy, bone disease).
Bilirubin: total bilirubin 0.1–1.2 mg/dL (2–20 µmol/L). Readings of 1.2–3.0, mostly indirect (unconjugated) bilirubin, with all other liver enzymes normal, is most likely Gilbert syndrome (a harmless variation in how the body processes bilirubin, found in about 5% of people). Above 3.0 mg/dL is jaundice, and the cause needs finding.
Albumin: 3.5–5.5 g/dL, reflecting the liver's ability to make proteins and your nutritional state. A low albumin can mean the liver is not making enough (advanced liver disease), malnutrition, or loss through the urine in kidney disease.
In practice · What helps mildly raised liver enzymes
If , and are mildly raised alongside features of metabolic syndrome, the most likely answer is metabolic dysfunction-associated steatotic liver disease, or .Weight loss of 7–10% is the most effective intervention. Vilar-Gomez 2015 was a prospective cohort study, not a randomized trial: among people who lost ≥ 10% of their weight through lifestyle change, 90% saw their steatohepatitis resolve (fatty liver with inflammation, then called NASH and now MASH). The practical steps are to limit fructose (especially sugary drinks), limit alcohol, follow a Mediterranean eating pattern, and combine aerobic exercise with strength training.
The Cochrane systematic review of milk thistle pooled trials in alcohol-related liver disease and in hepatitis B- or C-related liver disease, and found no reduction in liver-related deaths or complications; those trials were not done in fatty liver.
vilar-gomez-2015-lifestyle-nash
Chapter 5
Reading kidney tests and uric acid
The kidney is the body's filter. Blood plasma is pressed through an extremely fine mesh: waste passes on into the urine, and useful substances are taken back. Kidney-function tests ask whether that mesh still works properly.
Creatinine is a waste product your muscles make every day, and it leaves the body almost only through the kidneys. So a high creatinine has two common explanations: the mesh is failing, or this person simply has a lot of muscle. Someone who squats 170 kg can have a high creatinine with perfectly normal kidney function. That is why creatinine alone is not enough: read the estimated glomerular filtration rate () calculated from it, and take body build into account.
Uric acid is often thought of as a gout-only line, but it is also a probe of metabolism: by the mechanism, insulin resistance makes the kidneys excrete less uric acid, so blood uric acid rises. That is why high uric acid, high , low "good" cholesterol and mildly raised liver enzymes appearing together are another face of metabolic syndrome.
When to see a doctor: eGFR < 60 for 3 months; eGFR < 30 (see a kidney specialist); creatinine rising clearly over a short time; high blood potassium, or hyperkalemia (K > 6.0 mmol/L); an acute gout flare (a red, swollen, hot and painful joint).
Creatinine is a waste product your muscles make every day, and it leaves the body almost only through the kidneys. So a high creatinine has two common explanations: the mesh is failing, or this person simply has a lot of muscle. Someone who squats 170 kg can have a high creatinine with perfectly normal kidney function. That is why creatinine alone is not enough: read the estimated glomerular filtration rate () calculated from it, and take body build into account.
Uric acid is often thought of as a gout-only line, but it is also a probe of metabolism: by the mechanism, insulin resistance makes the kidneys excrete less uric acid, so blood uric acid rises. That is why high uric acid, high , low "good" cholesterol and mildly raised liver enzymes appearing together are another face of metabolic syndrome.
When to see a doctor: eGFR < 60 for 3 months; eGFR < 30 (see a kidney specialist); creatinine rising clearly over a short time; high blood potassium, or hyperkalemia (K > 6.0 mmol/L); an acute gout flare (a red, swollen, hot and painful joint).
Numbers · Kidney values and CKD stages
Creatinine: men 0.7–1.3, women 0.6–1.1 mg/dL (62–115 / 53–97 µmol/L). Creatinine is a product of muscle metabolism, cleared by the kidneys. People with a lot of muscle can have a high creatinine with perfectly normal kidney function.(estimated glomerular filtration rate): calculated with the CKD-EPI equation from creatinine, age and sex; the current version of the equation no longer includes race. ≥ 90 is normal; 60–89 is G2 (mildly reduced); 45–59 is G3a; 30–44 is G3b; 15–29 is G4; < 15 is G5 (kidney failure). An eGFR < 60 for 3 months meets the diagnosis of chronic kidney disease (). After 40, eGFR naturally falls by about 10 every 10 years; that is normal aging.
BUN (blood urea nitrogen): 7–20 mg/dL. A high value can mean dehydration, a high-protein diet or kidney failure. A BUN-to-creatinine ratio > 20 suggests dehydration (a prerenal cause, meaning the problem lies before the blood reaches the kidney).
Uric acid: men 3.7–8.6, women 2.4–6.0 mg/dL (220–420 / 150–360 µmol/L). Above 7 mg/dL, gout risk rises. But uric acid is not only about gout; it is also linked to insulin resistance: by the mechanism, insulin resistance reduces how much uric acid the kidneys excrete, and blood uric acid rises.
In practice · Eating for kidney values and uric acid
People with normal kidney function: studies have not found that a high-protein diet damages normal kidney function, and treating it as kidney-damaging is a common myth; stay well hydratedChronic kidney disease (): there is no single protein number; it is set by stage. Before dialysis the amount is usually lower than for other adults, and once dialysis starts it goes up. Your nephrologist and dietitian set the amount for your stage (the stage-by-stage figures are in the Renal System story). Limits on potassium, phosphorus and sodium are also set under their guidanceHigh uric acid or gout: limit alcohol (especially beer and spirits), fructose and high-purine foods (organ meats, rich meat broths, some seafood); lose weight, but avoid losing it fast, because the ketones produced then suppress uric acid excretion; drink enough water; cherries and dairy may help a little. Vitamin C at 500 mg/day has been seen to lower uric acid slightly (by about 0.5 mg/dL) in people without gout, but in people with gout two small randomized trials found changes too small to matter clinically, so the American College of Rheumatology (ACR) gout guideline conditionally recommends against adding vitamin C for people with goutChapter 6
Many results, one root cause
Now look at all the arrows together. Lipids, glucose metabolism, liver enzymes, uric acid, blood pressure and waist size are measured by different tests, in different tissues, and sit in different columns of the report. Yet they often move together, and one common shared upstream cause is insulin resistance.
Following the mechanism, the chain runs like this. The liver keeps pushing large amounts of into the blood, so triglycerides rise and "good" cholesterol falls. The liver stores fat in itself, and its enzymes leak out. The kidneys excrete less uric acid, so uric acid rises. Insulin makes the kidneys hold on to more sodium, so blood pressure rises. Insulin promotes fat storage around the organs, so the waist grows.
This means three things for you:
1. Do not worry about each arrow separately; they are often one problem.
2. Nor do you need to fix them one by one: improving insulin sensitivity tends to improve several markers at once.
3. Strength training, less refined carbohydrate, losing 5–10% of body weight and enough sleep are the levers that move these markers together.
But moving together is not the same as having a single cause: excess fat around the organs and drinking alcohol can also push several of these markers at the same time. Several markers shifting in the same direction is a strong clue, not proof.
Following the mechanism, the chain runs like this. The liver keeps pushing large amounts of into the blood, so triglycerides rise and "good" cholesterol falls. The liver stores fat in itself, and its enzymes leak out. The kidneys excrete less uric acid, so uric acid rises. Insulin makes the kidneys hold on to more sodium, so blood pressure rises. Insulin promotes fat storage around the organs, so the waist grows.
This means three things for you:
1. Do not worry about each arrow separately; they are often one problem.
2. Nor do you need to fix them one by one: improving insulin sensitivity tends to improve several markers at once.
3. Strength training, less refined carbohydrate, losing 5–10% of body weight and enough sleep are the levers that move these markers together.
But moving together is not the same as having a single cause: excess fat around the organs and drinking alcohol can also push several of these markers at the same time. Several markers shifting in the same direction is a strong clue, not proof.
Clinical · Which results together make the pattern
If your report shows these at the same time:raised (> 1.7 mmol/L)"Good" cholesterol () low (men < 1.0 / women < 1.3) mildly raised (men > 35 / women > 25)Uric acid raised (> 7 mg/dL)Fasting insulin high (> 10) or > 2.0Blood pressure raised (≥ 130/85)Waist over 90 cm in men / 80 cm in women
…then this is most likely one set of related changes, not seven unrelated problems. This list is not a diagnostic standard; it is a reminder to read the markers together and then take them to your doctor.
One more that often gets missed: insulin that stays high for a long time suppresses the liver's production of (SHBG), and a lower SHBG in turn changes how sex hormones read (for reading sex hormones, see Blood work decoded · specialized markers).
Chapter 7
Urgent results in a routine panel
These values are not adjust-your-lifestyle territory. They are signals to see a doctor soon, and for some of them immediately.
Emergency (same day):
Blood glucose > 16.7 mmol/L (300 mg/dL), especially with thirst, frequent urination or confusion: possible diabetic ketoacidosis or a hyperosmolar statePotassium < 3.0 or > 6.0 mmol/L: risk of a dangerous heart rhythmSodium < 125 or > 155 mmol/L: brain swelling or severe dehydration/ > 1000 U/L: acute liver injuryHemoglobin < 7 g/dL: severe anemiaPlatelets < 50,000/µL: bleeding risk
Prompt care (within 1–2 weeks) is a separate tier: markedly reduced kidney function, or high enough to call for screening for an inherited cause or for preventing pancreatitis, fasting glucose or at the diabetes diagnostic threshold, severely abnormal thyroid tests, and low albumin or jaundice.
Emergency (same day):
Blood glucose > 16.7 mmol/L (300 mg/dL), especially with thirst, frequent urination or confusion: possible diabetic ketoacidosis or a hyperosmolar statePotassium < 3.0 or > 6.0 mmol/L: risk of a dangerous heart rhythmSodium < 125 or > 155 mmol/L: brain swelling or severe dehydration/ > 1000 U/L: acute liver injuryHemoglobin < 7 g/dL: severe anemiaPlatelets < 50,000/µL: bleeding risk
Prompt care (within 1–2 weeks) is a separate tier: markedly reduced kidney function, or high enough to call for screening for an inherited cause or for preventing pancreatitis, fasting glucose or at the diabetes diagnostic threshold, severely abnormal thyroid tests, and low albumin or jaundice.
Red flag · Results that need a doctor within 1–2 weeks
This tier does not mean the emergency department today, but it does not mean "wait for the next checkup" either. Book a clinic appointment and bring the report.Prompt care (within 1–2 weeks):
< 30Creatinine > 4.0 mg/dL (354 µmol/L) ≥ 4.9 mmol/L (190 mg/dL): screen for familial hypercholesterolemia > 5.6 mmol/L (500 mg/dL): pancreatitis riskFasting glucose ≥ 7.0 or ≥ 6.5%: diabetes diagnosis > 20 or < 0.01 (for reading thyroid tests, see Blood work decoded · specialized markers)Albumin < 3.0 g/dL or fallingBilirubin > 3.0 mg/dL (jaundice)
In practice · Rechecking a single mild abnormality
Monitor, don't panic:A single mild abnormality ( 40, uric acid 7.5, 1.8): usually you can adjust your lifestyle for 3–6 months first, then recheckA value inside the reference range but close to the upper limit: read it as part of the pattern across several markers, not in isolation
Disclaimer: this story is health education, not a medical diagnosis. Discuss any treatment decision (starting or stopping a medication, taking a supplement) with your doctor. This site does not replace an in-person consultation with a doctor.
Chapter 8
Nutrition does not replace treatment
To close, a clear statement of what nutrition can and cannot do. What it can do is real, but every effect is limited in size. The cannot-do list comes first, because treating food as a drug is where the danger lies.
What nutrition cannot do:
Replace statins in lowering for people at high or very high risk (diet lowers it by only 10–15%; the target may require 50%+)Replace glucose-lowering drugs or insulin in treating established diabetesMake chronic kidney disease go away (though the right nutrition can slow its progression)Dissolve plaque that has already formed (though it may help slow progression)Replace urate-lowering drugs in treating recurrent gout
The right mindset: nutrition and medication are not a choice between two options, and not a handover from one to the other. The better your nutrition, the smaller the gap medication usually has to fill; when the gap is there, take the medication you need. Diet is something you do alongside it, not instead of it.
More specialized markers (thyroid, sex hormones, , , , ) are covered in Blood work decoded · specialized markers.
What nutrition cannot do:
Replace statins in lowering for people at high or very high risk (diet lowers it by only 10–15%; the target may require 50%+)Replace glucose-lowering drugs or insulin in treating established diabetesMake chronic kidney disease go away (though the right nutrition can slow its progression)Dissolve plaque that has already formed (though it may help slow progression)Replace urate-lowering drugs in treating recurrent gout
The right mindset: nutrition and medication are not a choice between two options, and not a handover from one to the other. The better your nutrition, the smaller the gap medication usually has to fill; when the gap is there, take the medication you need. Diet is something you do alongside it, not instead of it.
More specialized markers (thyroid, sex hormones, , , , ) are covered in Blood work decoded · specialized markers.
Numbers · How much nutrition can move each marker
What nutrition can do:Improve insulin sensitivity (less refined carbohydrate, strength training, weight loss, enough sleep), which tends to improve , "good" cholesterol, , uric acid and togetherLower low-density lipoprotein cholesterol () by 10–15% (replacing saturated with unsaturated fat, more fiber, plant sterols)Lower triglycerides (TG) by 20–40% (less sugar and alcohol, weight loss, fish oil)Lower blood pressure (the DASH diet, an eating pattern rich in vegetables, fruit and low-fat dairy; less sodium; weight loss; exercise)Reduce how often gout flares (less fructose and alcohol, weight loss, drinking enough water)Help fat clear from the liver (a 7–10% weight loss is the most effective intervention for )
Note the size of the effect after each line: every one of them is real, and none of them is on the scale of a drug.
References · 16
- Matthews, D. R., Hosker, J. P., Rudenski, A. S., Naylor, B. A., Treacher, D. F., & Turner, R. C. (1985). Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia, 28(7), 412-419. Original HOMA model from Oxford; HOMA-IR = insulin (µU/mL) × glucose (mM) / 22.5. 10.1007/BF00280883
- Gayoso-Diz, P., Otero-Gonzalez, A., Rodriguez-Alvarez, M. X., Gude, F., Cadarso-Suarez, C., Garcia, F., & de Francisco, A. (2013). Insulin resistance (HOMA-IR) cut-off values and the metabolic syndrome in a general adult population: effect of gender and age: EPIRCE cross-sectional study. BMC Endocrine Disorders, 13, 47. n=2,459 Spanish adults; HOMA-IR cutoffs for cardiometabolic risk vary by age/gender; range 1.5–3.0 for clinically meaningful IR. 10.1186/1472-6823-13-47
- Mach, F., Baigent, C., Catapano, A. L., Koskinas, K. C., Casula, M., Badimon, L., et al. (2020). 2019 ESC/EAS guidelines for the management of dyslipidaemias. European Heart Journal, 41(1), 111-188. 10.1093/eurheartj/ehz455
- Grundy, S. M., Stone, N. J., Bailey, A. L., Beam, C., Birtcher, K. K., Blumenthal, R. S., et al. (2019). 2018 AHA/ACC/AACVPR/AAPA/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA guideline on the management of blood cholesterol. Circulation, 139(25), e1082-e1143. 10.1161/CIR.0000000000000625
- Varbo, A., Benn, M., Tybjærg-Hansen, A., Jørgensen, A. B., Frikke-Schmidt, R., & Nordestgaard, B. G. (2013). Remnant cholesterol as a causal risk factor for ischemic heart disease. Journal of the American College of Cardiology, 61(4), 427-436. 10.1016/j.jacc.2012.08.1026
- Baneu, P., Vacarescu, C., Dragan, S. R., Cirin, L., Lazar-Hocher, A. I., Cozgarea, A., et al. (2024). The triglyceride/HDL ratio as a surrogate biomarker for insulin resistance. Biomedicines, 12(7), 1493. PRISMA-guided systematic review of 32 studies over 20 years (n=49,782, multi-ethnic, adults and children) compared against HOMA-IR; average cutoffs 2.53 (women) and 2.8 (men), with accuracy varying by ethnicity and sex. 10.3390/biomedicines12071493
- American Diabetes Association. (2024). Standards of Medical Care in Diabetes — 2024. Diabetes Care, 47(Suppl. 1). diabetesjournals.org/care/issue/47/Supplement_1
- Shukla, A. P., Iliescu, R. G., Thomas, C. E., & Aronne, L. J. (2015). Food order has a significant impact on postprandial glucose and insulin levels. Diabetes Care, 38(7), e98-e99. Pilot letter: 11 adults with metformin-treated type 2 diabetes, within-subject crossover (the letter does not say the order was randomised), the same 628 kcal meal on 2 days a week apart. Eating vegetables and protein before carbohydrate lowered glucose by 28.6%, 36.7% and 16.8% at 30, 60 and 120 min and glucose iAUC by 73% vs the reverse order (full text, PMC4876745). 10.2337/dc15-0429
- Chalasani, N., Younossi, Z., Lavine, J. E., Charlton, M., Cusi, K., Rinella, M., et al. (2018). The diagnosis and management of nonalcoholic fatty liver disease: practice guidance from the American Association for the Study of Liver Diseases. Hepatology, 67(1), 328-357. 10.1002/hep.29367
- Liu, C., Shao, M., Lu, L., Zhao, C., Qiu, L., & Liu, Z. (2021). Obesity, insulin resistance and their interaction on liver enzymes. PLOS ONE, 16(4), e0249299. Among 7,066 non-diabetic Chinese adults, insulin resistance was an independent determinant of ALT, AST and GGT after adjusting for age, sex, BMI, triglycerides and cholesterol, and interacted with weight status on all three enzymes. 10.1371/journal.pone.0249299
- Rambaldi, A., Jacobs, B. P., & Gluud, C. (2007). Milk thistle for alcoholic and/or hepatitis B or C virus liver diseases. Cochrane Database of Systematic Reviews, (4), CD003620. No significant effect on mortality or complications of liver disease. 10.1002/14651858.CD003620.pub3
- Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. (2024). KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International, 105(4S), S117-S314. Recommendation 3.3.1.1: 'We suggest maintaining a protein intake of 0.8 g/kg body weight/d in adults with CKD G3-G5 (2C)' - a weak suggestion on low-certainty evidence, described as consistent with the WHO allowance for the general population. Practice points: avoid > 1.3 g/kg/d in adults at risk of progression; for those willing, able and at risk of kidney failure, consider a very low-protein diet (0.3-0.4 g/kg/d) supplemented with essential amino acids or ketoacid analogs (up to 0.6 g/kg/d) under close supervision; no low- or very low-protein diets when metabolically unstable; no protein restriction in children. The Work Group states the evidence does NOT support low-protein diets alone (0.4-0.6 g/kg/d) as a strategy to slow CKD progression. Sodium: < 2 g/day (2C) (full text, KDIGO open-access PDF of the supplement, section 3.3). Comparing with kdoqi-2020-nutrition-ckd needs that guideline's own protein statements, which its record does not carry. 10.1016/j.kint.2023.10.018
- Dalbeth, N., Choi, H. K., Joosten, L. A. B., Khanna, P. P., Matsuo, H., Perez-Ruiz, F., & Stamp, L. K. (2019). Gout. Nature Reviews Disease Primers, 5(1), 69. 10.1038/s41572-019-0115-y
- FitzGerald, J. D., Dalbeth, N., Mikuls, T., Brignardello-Petersen, R., Guyatt, G., Abeles, A. M., et al. (2020). 2020 American College of Rheumatology guideline for the management of gout. Arthritis Care & Research, 72(6), 744-760. Strongly recommends starting urate-lowering therapy (ULT) in patients with ≥ 2 flares/year, tophi, or radiographic damage; conditionally against initiating ULT for asymptomatic hyperuricemia. Treat-to-target SUA < 6 mg/dL. Strong indications are ≥ 1 subcutaneous tophus, radiographic damage attributable to gout, or ≥ 2 flares a year; after a FIRST flare ULT is conditionally recommended against, except that it is conditionally recommended when CKD stage ≥ 3, serum urate > 9 mg/dl, or urolithiasis is present (very low certainty). Start allopurinol at ≤ 100 mg/day, lower in CKD (strong). HLA-B*5801 testing before allopurinol is conditionally recommended for patients of Southeast Asian descent (e.g., Han Chinese, Korean, Thai) and African American patients, and conditionally recommended against for all others. Adding vitamin C is conditionally recommended against (low certainty): two small RCTs (n = 29 and n = 40) showed clinically insignificant serum urate changes. For cherries/cherry extract and dairy protein the evidence, mainly observational, was low or very low certainty, so the panel made NO recommendation either way. Limiting alcohol and purine intake (low certainty) and high-fructose corn syrup (very low), and weight loss if overweight (very low), are all conditional (full text, PMC10563586). 10.1002/acr.24180
- Asma Sakalli, A., Kucukerdem, H. S., & Aygun, O. (2023). What is the relationship between serum uric acid level and insulin resistance? A case-control study. Medicine (Baltimore), 102(52), e36732. Retrospective case-control of 2,530 records; uric acid differed between insulin-resistant and insulin-sensitive groups (p<0.001) with a weak positive correlation to HOMA-IR (r=0.299, p<0.001); insulin resistance can raise urate by reducing renal excretion via increased sodium reabsorption. 10.1097/MD.0000000000036732
- Libby, P. (2017). Interleukin-1 beta as a target for atherosclerosis therapy: biological basis of CANTOS and beyond. Journal of the American College of Cardiology, 70(18), 2278-2289. 10.1016/j.jacc.2017.09.028