Diabetes mellitus in pregnancy

**Definition:** A condition caused by dysfunctional maternal insulin receptors. This condition is characterised by glucose intolerance with onset or first recognition during pregnancy, with at least one of the following criteria met: fasting plasma glucose greater than or equal to 7.0 millimoles per litre (126 mg/dL); 2-hour plasma glucose greater than or equal to 11.1 millimoles per litre (200 mg/dL) following a 75 gram oral glucose load; random plasma glucose greater than or equal to 11.1 millimoles per litre (200 mg/dL). Confirmation is by an oral glucose tolerance test.