Diagnostic Criteria and Screening for Overt Diabetes Mellitus in Pregnancy

Diagnostic Criteria

In the absence of unequivocal hyperglycemia, diagnostic criteria should be confirmed by repeat testing, as recommended by the American Diabetes Association 1, 2
Standard diagnostic tests should be performed in the fasting state, according to clinical guidelines 3

Screening for undiagnosed type 2 diabetes at the first prenatal visit is recommended for women with risk factors, such as obesity or metabolic syndrome, as suggested by the American Diabetes Association 2
For oral glucose tolerance testing, an overnight fast of at least 8 hours is required, as stated in the clinical guidelines from the American Diabetes Association 4, 3
In cases of discordant test results, the test whose result is above the diagnostic cut point should be repeated, as recommended by the American Diabetes Association 2

Using GDM diagnostic thresholds for diagnosing overt diabetes can lead to overdiagnosis, as noted in the American Diabetes Association guidelines 4
Not confirming abnormal results with repeat testing may lead to misdiagnosis, as warned by the American Diabetes Association 1, 2
Relying solely on random glucose measurements without confirmatory testing can be misleading, according to the American Diabetes Association 2