Passage: 3 hour blood glucose level ≥140 mg/dl (7.8 mmol/L)An alternative test uses a 75 g glucose load and measures the blood glucose levels before and after 1 and 2 hours, using the same reference values.This test will identify fewer women who are at risk, and there is only a weak concordance (agreement rate) between this test and a 3-hour 100 g test.The glucose values used to detect gestational diabetes were first determined by O'Sullivan and Mahan (1964) in a retrospective cohort study (using a 100 grams of glucose OGTT) designed to detect risk of developing type 2 diabetes in the future.The values were set using whole blood and two values reaching or exceeding the value to be positive.Subsequent information led to alterations in O'Sullivan's blood methods.When changed from the venous samples for determination of glucose levels to a 3-hour 100 g test, there is only a weak concordance (agreement rate) between this test and a 3-hour 100 g test.The glucose values used to detect gestational diabetes were first determined by O'S
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