What is a Glucose Tolerance Test?
The Glucose Tolerance Test measures the body's Glucose Tolerance through blood testing.
Why is a Glucose Tolerance Test important?
A Glucose Tolerance Test is used to diagnose diabetes and assess the body's response to ingested glucose.
How is a Glucose Tolerance Test performed?
This test is run over 2 hours. First, a glucose solution is drunk and blood is drawn. Two hours later, another specimen is drawn. The results will assess the body's response to the glucose ingested.
Increased glucose rise (decreased glucose tolerance) in: Diabetes mellitus, impaired glucose tolerance, gestational diabetes, severe liver disease,hyperthyroidism, stress
(infection), increased absorption of glucose from GI tract (hyperthyroidism, gastrectomy,
gastroenterostomy, vagotomy, excess glucose intake) , Cushing syndrome, pheochromocytoma. Drugs: diuretics, oral contraceptives, glucocorticoids, nicotinic acid, phenytoin. Decreased glucose rise (flat glucose curve) in: Intestinal disease (celiac sprue, Whipple disease), adrenal insufficiency (Addison disease,hypopituitarism), pancreatic
islet cell tumors, or hyperplasia
*This Glucose Tolerance Test is a blood test.
*An 8-12 hour fast is recommended before testing.