Table 2: International Diabetes Federation (IDF) metabolic syndrome worldwide definition (IDF, 2006).

Central obesityWaist circumference—ethnicity specific plus any two of the following:

Raised triglycerides≥1.7 mmol/L (150 mg/dl) or specific treatment

Reduced HDL-C<1.03 mmol/L (40 mg/dl in males)
<1.29 mmol/L (50 mg/dl) in females
or specific treatment

Raised blood
Systolic ≥130 mmHg
Diastolic ≥85 mmHg
or treatment of previously diagnosed hypertension

Raised fasting
plasma glucose
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.

This is the first classification indicating central obesity as an obligatory component of MetS.
HDL-C: High-density lipoprotein-cholesterol.