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Metabolic syndrome: five numbers, three of them matter

Not an index someone invented — a definition seven organisations agreed on in 2009. Check your own numbers against it.

1. Waist circumference not met

2. Triglycerides not met

≥150 mg/dL
≥1.7 mmol/L

3. HDL cholesterol not met

4. Blood pressure not met

≥130 systolic
and/or ≥85 diastolic

5. Fasting glucose not met

≥100 mg/dL
≥5.6 mmol/L
0 of 5

Three or more of the five meets the 2009 harmonized definition. Treatment for a component counts as meeting it — that is how the definition is written, because treatment implies the underlying finding.

Why this one isn't just another index

Plenty of metabolic scores float around the internet with cut points nobody agreed on. This isn't one of them. In 2009 the International Diabetes Federation, the American Heart Association, the National Heart, Lung and Blood Institute, the World Heart Federation, the International Atherosclerosis Society and the International Association for the Study of Obesity published a joint statement that settled the disagreement: five components, any three of which meet the definition.

That matters because it means the thresholds here aren't an opinion. They are the numbers your doctor is also using.

Waist is the one that genuinely depends on who you are. The harmonized statement doesn't give a single waist number — it gives different cut points by population, because the waist at which metabolic risk rises differs between groups. For people of Asian origin the threshold is roughly 90 cm for men and 80 cm for women; the US figures are 102 cm and 88 cm. Using the wrong set is the most common way this check goes wrong, which is why the selector is at the top rather than buried.

The five criteria as published

ComponentThresholdTreatment counts?
Waist circumferencePopulation- and sex-specific (see selector)—
Triglycerides≥150 mg/dL (1.7 mmol/L)Yes
HDL cholesterol<40 mg/dL (1.0 mmol/L) men
<50 mg/dL (1.3 mmol/L) women		Yes
Blood pressure≥130 systolic and/or ≥85 diastolicYes
Fasting glucose≥100 mg/dL (5.6 mmol/L)Yes

What meeting three actually means

It is not a disease diagnosis, and it is not a sentence. Metabolic syndrome is a risk clustering — a way of noticing that several things have drifted together, because they tend to share a cause and because the combination carries more risk than any one of them alone. The useful response is not alarm; it is that the same handful of levers move several of these numbers at once.

Three of the five — triglycerides, HDL and fasting glucose — are the ones that tend to respond to the same things: movement after meals, keeping muscle, fibre, sleep. If you want the graded evidence rather than the claims, that's what the Evidence Library is for. If you have fasting insulin on your panel too, the HOMA-IR calculator adds a different angle on the same question.

Take the result to your doctor rather than acting on it alone. They can see the things this page can't: your family history, your other labs, your medications, and whether any single number was a one-off.

Educational tool only — not a diagnostic tool, not medical advice, and not a substitute for assessment by your healthcare team. Blood pressure measured once at home is not the same as a clinical diagnosis of hypertension. Nothing you enter here is stored or sent anywhere.

Sources

  1. Alberti KGMM, Eckel RH, Grundy SM, Zimmet PZ, Cleeman JI, Donato KA, Fruchart J-C, James WPT, Loria CM, Smith SC Jr. Harmonizing the metabolic syndrome: a joint interim statement of the IDF Task Force on Epidemiology and Prevention; NHLBI; AHA; World Heart Federation; International Atherosclerosis Society; and IASO. Circulation. 2009;120:1640–1645. pubmed.ncbi.nlm.nih.gov/19805654
  2. Full text and criteria tables: world-heart-federation.org (PDF)

What now?

Several of these numbers move together, which means a small number of habits move several of them.

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