Glucose Tolerance

Endocrinologists, general practitioners, or obstetricians typically request a Glucose Tolerance Test (GTT). While endocrinologists may request it for patients showing symptoms of diabetes or metabolic disorders, obstetricians often use it to screen for gestational diabetes in pregnant women. General practitioners recommend it based on a patient's risk factors, symptoms, or family history.

‍

The test begins with a fasting blood sample to measure baseline glucose levels. After this, the patient consumes a specified glucose solution. Subsequent blood samples are taken regularly, usually over three hours, to measure the body's response to the glucose challenge. The pattern of glucose levels over time helps determine if a person has normal glucose metabolism, impaired glucose tolerance, or diabetes.

A standard Glucose Tolerance Test usually takes about three to four hours from start to finish. This includes the initial fasting blood draw, the waiting period after consuming the glucose solution, and the subsequent blood draws at specified intervals (typically every 30 to 60 minutes for up to three hours).