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How does the Oral glucose Tolerance test differ?

Oral Glucose Tolerance Test (OGTT) involves challenges of glucose of about 50-75g to be taken with water. It involves the administration of a standard oral glucose load followed by serial blood glucose testing. The basic difference between OGTT and normal testing is OGTT involves glucose in liquid form which could be rapidly absorbed into the bloodstream and increase the sugar levels quickly that the insulin production is challenged. Normal meal of carbs (starch) is in solid state and it takes longer time for digestion and assimilation. The OGTT can be used to screen for impaired glucose tolerance (prediabetes) and diabetes mellitus. However , given the comparative ease of administration of the other two tests that can be used to diagnose diabetes/pre-diabetes (fasting glucose and Hemoglobin A1c) , the OGTT is typically reserved for specific clinical scenarios as screening for Gestational diabetes between 24-28th week of pregnancy.