Incidence of Gestational Diabetes Diagnosed on the 100-G Glucose Tolerance Test in Pregnancies with a 50-G Glucose Challenge Test Result of 200 mg/dL or Greater.

· A 50-g GCT result of 200 mg/dL or greater has a PPV of 81% for GDM on the 100 g GTT.. · Patients diagnosed with GDM by GCT alone were as likely to require insulin as those diagnosed by GTT.. · 81% of patients diagnosed with GDM on the GTT completed their GTT at least 1 week after the GCT, thus requiring GTT in this population may lead to unnecessary delays in care..