Threshold Values for Diagnosing Overt Diabetes in Pregnancy

Test*

Threshold Value

Fasting plasma glucose

126 mg/dL [7.0 mmol/L]

HbA1C (glycosylated hemoglobin)

6.5%

Random plasma glucose

200 mg/dL on > 1 occasion

* Fasting plasma glucose and HbA1C are measured if clinicians suspect diabetes (eg, in patients with risk factors, such as obesity, a strong family history of diabetes, or a history of gestational diabetes in a previous pregnancy).