OGT Gestational Diabetes and Pregnancy Testing

Question 1

Which glucose load is used in the standard diagnostic OGTT for gestational diabetes in the United States?

Accepted Answer

100 g

Answer

The 3-hour 100 g OGTT is the standard diagnostic test for gestational diabetes (GDM) in the US per ACOG guidelines.

Question 2

What is the recommended screening week range for gestational diabetes testing in pregnant women without prior risk factors?

Accepted Answer

24–28 weeks

Answer

Universal gestational diabetes screening with a 50 g glucose challenge test or OGTT is recommended at 24–28 weeks of gestation.

Question 3

Which of the following is a risk factor that may prompt earlier GDM screening before 24 weeks?

Accepted Answer

Previous GDM in a prior pregnancy

Answer

Women with a history of gestational diabetes are at high risk of recurrence and should be screened early in subsequent pregnancies.

Question 4

What fasting glucose threshold (Carpenter-Coustan criteria) identifies gestational diabetes on a 100 g OGTT?

Accepted Answer

≥95 mg/dL

Answer

Under Carpenter-Coustan criteria, a fasting glucose of ≥95 mg/dL on the 100 g OGTT is one of the four diagnostic thresholds for GDM.

Question 5

How many abnormal values on the 100 g 3-hour OGTT are required to diagnose gestational diabetes (Carpenter-Coustan)?

Accepted Answer

Two

Answer

A diagnosis of GDM under Carpenter-Coustan criteria requires two or more abnormal values on the 4-point 100 g OGTT.

OGT - Oral Glucose Tolerance Practice Test