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Oral Glucose Tolerance Test
is performed to diagnose Gestational Diabetes
which occurs during pregnancy
. It is the process of taking a series of blood glucose measurements after the patient drinks a sweet liquid that contains a high quantity of glucose. A normal blood sugar level after an oral glucose tolerance test is lower than 140 mg/dL. If the blood sugar level is 140 mg/dL to 199 mg/dL then the patient is diagnosed with prediabetes.