The discordance between HbA1c and glucose tolerance testing for the postpartum exclusion of diabetes following gestational diabetes.

Aims: To assess the concordance between the HbA1c and the oral glucose tolerance test (OGTT) for the diagnosis of diabetes and prediabetes following gestational diabetes (GDM) in an ethnically diverse population.

Methods: Women with GDM underwent a concurrent OGTT and HbA1c test 6-12 weeks postpartum.

Results: There were 114 women with GDM who had a 75 g 2-h OGTT and HbA1c at 9.