What are the diagnostic thresholds for gestational diabetes mellitus using a 75g 2-hour oral glucose tolerance test?

For a 75g 2-hour oral glucose tolerance test, gestational diabetes mellitus is diagnosed if fasting plasma glucose is 5.6 mmol/L or above, or if the 2-hour plasma glucose is 7.8 mmol/L or above.

The diagnostic criteria use two threshold values from the OGTT. A fasting plasma glucose level of 5.6 mmol/L or higher meets the diagnosis. Alternatively, a 2-hour plasma glucose level of 7.8 mmol/L or higher also meets the diagnosis. Either one of these values is sufficient to diagnose gestational diabetes.