Diabetes mellitus in pregnancy: Gestational diabetes mellitus diagnostic criteria

Diagnosis of gestational diabetes mellitus is based on oral glucose tolerance test, which is usually done after 24 weeks of gestation. In most parts of the world the diagnostic criteria are based on either the 100 gram 3-hour test or the 75 gram 2-hour test. Many national bodies have created their own criteria based on local experience and their healthcare systems. The test is usually done when there is indication, which is the presence of risk for gestational diabetes mellitus. Risk assessment for gestational diabetes mellitus should be undertaken at the first antenatal visit. Pregnant women with no risk may not need to undergo the test. Some women with very high risk for gestational diabetes mellitus may need to take the test earlier than 24 weeks.

These are some different guidelines for diagnosis of gestational diabetes mellitus.

One abnormal value is sufficient for diagnosis

One abnormal value is sufficient for diagnosis
IADPSG=International Association of Diabetes and Pregnancy Study Groups

At least 2 abnormal values are needed to make diagnosis
ADA=American Diabetes Association

Positive screening indicates need for diagnostic test of 100g glucose load
For the diagnostic test, least 2 abnormal values are needed to make diagnosis
ACOG=American College of Obstetricians and Gynecologists

Positive screening indicates need for diagnostic test of 75g glucose load
For the diagnostic test, least 2 abnormal values are needed to make diagnosis