The 2-hour plasma glucose (2-h PG) test, also known as the oral glucose tolerance test (OGTT), is a diagnostic test for diabetes and other glucose metabolism disorders. This test measures the blood glucose levels two hours after a person has consumed a liquid containing a standardized amount of glucose. It is typically performed after an overnight fast.

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Reference: Piché ME, Lemieux S, Pérusse L, Weisnagel SJ. High normal 2-hour plasma glucose is associated with insulin sensitivity and secretion that may predispose to type 2 diabetes. Diabetologia. 2005;48(4):732-740.