Glucose Tolerance Test

Alternate Names

  • Oral Glucose Tolerance Test (OGTT)

Insulin levels rise following a meal, which lowers blood sugar (glucose) levels to normal within 2 to 3 hours. Adequate insulin levels are not released in people with DM (diabetes mellitus) which results in blood sugar levels remaining elevated for up to five hours following a meal. After a fast period, you will be given a drink containing high sugar levels, then blood and urine sugar levels are measured at regular intervals. DM is diagnosed when blood sugar levels are over 200 milligrams/deciliter at 1 through 5 hours following ingestion of the high glucose drink. The Glucose Tolerance Test (GTT) can also be used to diagnose hypoglycemia, which is caused by over secretion of insulin which causes very low blood sugar levels around five hours after eating.


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