Table 1.

Definition of Metabolic Syndrome and Constituent Risk Factors According to the IDF and AHA Update to the NCEP ATP III

Central obesity (obese)	Waist circumference as measure of central obesitya (male ≥90 cm; female ≥80 cm for Asians) plus any two of the following:
Elevated triglycerides (high TGL)	≥1.7 mmol/L (150 mg/dL) or specific treatment for this lipid abnormality
Low HDL-C (low HDL)	<1.03 mmol/L (40 mg/dL) in males;<1.29 mmol/L (50 mg/dL) in females; or specific treatment for this lipid abnormality
Elevated blood pressure (high BP)	Systolic ≥130 mm Hg or diastolic ≥85 mmHg or treatment of previously diagnosd hypertension
Elevated fasting plasma glucose (high FBG)	Fasting plasma glucose ≥5.6 mmol/L (100 mg/dL) or previously diagnosed type 2 diabetes. If >5.6 mmol/L or 100 mg/dL, oral glucose tolerance test is strongly recommended but is not necessary to define presence of the syndrome
IDF definition of metabolic syndrome (MetS-1)	Central obesity plus at least two other risk factors.
ATP III definition of metabolic syndrome (MetS-2)	At least three risk factors.

Sources: Alberti et al. (2006),²² Grundy et al. (2004).²⁵

^aIf body mass index is >30 kg/m², then central obesity can be assumed, and waist circumference does not need to be measured.

IDF, International Diabetes Foundation; NCEP ATP III, National Cholesterol Education Program Adult Treatment Panel III; TGL, triglycerides; HDL-C, high-density lipoprotein cholesterol; BP, blood pressure; FBG, fasting blood glucose.