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Metabolic Syndrome

General

Metabolic Syndrome

A cluster of five risk factors — elevated waist circumference, high blood pressure, high blood sugar, high triglycerides, and low HDL — that together significantly raise cardiovascular and diabetes risk.

Definition

Metabolic Syndrome is a cluster of five risk factors that, when three or more are present together, significantly raise the risk of cardiovascular disease and type 2 diabetes. No single factor alone defines the syndrome — it's specifically the combination that matters, since each factor compounds risk when it occurs alongside the others.

The Metabolic Syndrome Calculator checks your values against the standard diagnostic thresholds for all five criteria.

Formula

There is no numeric formula for metabolic syndrome — it's a threshold-based classification requiring three or more of the following five criteria:

  1. Elevated waist circumference (varies by population and sex-specific thresholds)
  2. High blood pressure (commonly 130/85 mmHg or above)
  3. High fasting blood sugar (commonly 100 mg/dL or above)
  4. High triglycerides (commonly 150 mg/dL or above)
  5. Low HDL cholesterol (commonly under 40 mg/dL for men, under 50 mg/dL for women)

Worked Example

A person with a waist circumference above their threshold, blood pressure of 135/88, and triglycerides of 165 mg/dL meets three criteria — enough for a metabolic syndrome classification, even if their blood sugar and HDL are both within normal range.

Key Things to Know

  • Three or more criteria trigger the classification: no single abnormal value alone constitutes metabolic syndrome.
  • BMI-independent: it's possible to have a normal BMI and still meet the criteria if fat distribution and other markers are unfavourable.
  • Overlaps with the cholesterol ratio and VLDL: triglycerides, one of the five criteria, also drives VLDL and affects overall lipid risk assessment.
  • A screening framework, not a single test: metabolic syndrome combines multiple existing lab values and measurements rather than requiring a new specific test.

Related Calculators

Metabolic Syndrome Calculator →Check how many of the 5 NCEP ATP III metabolic syndrome criteria you meet — waist circumference, triglycerides, HDL, blood pressure, and fasting glucose.
Cholesterol Ratio Calculator →Calculate your total cholesterol-to-HDL ratio, LDL/HDL ratio, and non-HDL cholesterol from a standard lipid panel, with AHA-based cardiovascular risk context.
Waist to Height Ratio Calculator →Calculate your waist-to-height ratio, a strong predictor of cardiovascular and metabolic health risk, and see your result compared to the 0.5 threshold.

Related Terms

Cholesterol RatioTotal Cholesterol to HDL RatioWHRWaist-to-Hip Ratio

Frequently Asked Questions

Metabolic syndrome is typically diagnosed when three or more of the five criteria are present, even if no single value is dramatically abnormal on its own. The [Metabolic Syndrome Calculator](/metabolic-syndrome-calculator/) checks your values against all five thresholds.
Elevated waist circumference, high blood pressure, high fasting blood sugar, high triglycerides, and low HDL cholesterol — each has its own specific threshold used in diagnosis.
Waist circumference specifically reflects visceral fat (fat around the organs), which is more strongly linked to cardiovascular and metabolic risk than total body weight or BMI alone.
Yes — it's possible to have a normal BMI while still meeting three or more of the five metabolic syndrome criteria, particularly if fat is concentrated around the abdomen (sometimes called 'normal weight obesity').
Weight loss (particularly reducing abdominal fat), regular exercise, and dietary changes targeting blood sugar and triglycerides are the most consistently evidence-backed interventions across all five criteria.