glu·cose tol·er·ance test (GTT),

a test for diabetes, or for hypoglycemic states such as may be seen, rarely, in patients with insulinomas. Following ingestion of 75-g glucose while the patient is fasting, the blood sugar promptly rises and then falls to normal within 2 hours; in diabetic patients, the increase is greater and the return to normal unusually prolonged; in hypoglycemic patients, depressed glucose levels may be observed in 3-, 4-, or 5-hour measurements.

Farlex Partner Medical Dictionary © Farlex 2012

glucose tolerance test

A standardized test that measures the body's response to an oral–challenge dose of glucose, which is primarily used to confirm the diagnosis of DM, and may be performed in individuals with symptoms–eg ↑ fasting glucose level, hypertriglycerdemia, neuropathy, impotence, glycosuria that are suggestive of DM; in pregnancy GTT is used to diagnose gestational DM

glu·cose tol·er·ance test

(GTT) (glū'kōs tol'ĕr-ăns test)

A test for diabetes, or for hypoglycemic states such as may be seen rarely in patients with insulinomas. Following ingestion of 75 g of glucose while the patient is fasting, the blood sugar promptly rises and then falls to normal within 2 hours; in diabetic patients, the increase is greater and the return to normal unusually prolonged; in hypoglycemic patients, depressed glucose levels may be observed in 3-, 4-, or 5-hour measurements.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

glucose tolerance test

A test of the body's response to a dose of glucose after a period of fasting. The blood sugar levels are measured at various intervals after the sugar is taken and the results plotted on a graph. A characteristic shape of the curve occurs in DIABETES because the blood sugar levels rise to an abnormal height and take longer than usual to return to normal. A urine test also shows sugar, in diabetes.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

glu·cose tol·er·ance test

(GTT) (glū'kōs tol'ĕr-ăns test)

Assessment for diabetes or for hypoglycemic states. Following ingestion of 75-g glucose while the patient is fasting, blood sugar promptly rises and then falls to normal within 2 hours; in diabetic patients, increase is greater and return to normal unusually prolonged; in hypoglycemic patients, depressed glucose levels may be observed in 3-, 4-, or 5-hour measurements.

Medical Dictionary for the Dental Professions © Farlex 2012

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References in periodicals archive

Comparison between peak values and peak decline of intravenous glucose tolerance test insulin secretion

Use of First-phase Insulin Secretion in Early Diagnosis of Thyroid Diabetes and Type 2 Diabetes Mellitus

A similar increase in the insulin levels before the advent of impaired glucose tolerance test and diabetes was also demonstrated in a study by Flynn et al.

Study of glucose tolerance in children with transfusion dependent thalassemia and its correlation with serum ferritin

The glucose tolerance test with insulin gives you great information about where your body is right now, on the day of the test.

Three blood tests to help you better manage the risks of high blood sugar

* glucose loads during the glucose tolerance test (75 and 100 g in the ACHOIS and MFMU studies, respectively)

Does treatment of mild gestational diabetes improve pregnancy outcome?

The women underwent several assessments, including an oral fasting glucose tolerance test and dual-energy x-ray absorptiometry (DXA) scan.

Hostility, fasting glucose linked in black women

Three-hour oral glucose tolerance tests were performed using 75 g of dextrose.

Do glucosamine and chondroitin worsen blood sugar control in diabetes?

The Clinical Practice Recommendations issued by the American Diabetes Association (ADA) in 2003 (1) state that GDM is diagnosed on the basis of the oral glucose tolerance test (OGTT).

Lack of concordance between the 75-g and 100-g glucose load tests for the diagnosis of gestational diabetes mellitus

The evidence: Chromium supplements came up empty in all but one of the six good studies that looked at people at risk of diabetes (they were overweight, had a family history, or had abnormal responses to a glucose tolerance test).

Sugar pills: fighting diabetes with supplements

To prove that glucose tolerance is altered, we performed an intraperitoneal glucose tolerance test in fasted (12 hr) mice.

The estrogenic effect of bisphenol a disrupts pancreatic [beta]-cell function in vivo and induces insulin resistance

Glucose tolerance will be measured by fasting insulin and 2-hour post 75-gram oral glucose tolerance test (OGTT).

Chromium picolinate trial initiated

On metabolic evaluation, the patient's glucose tolerance test results were flat and her serum insulin levels were elevated.

Electronystagmography: Frequently overlooked significant findings. (Vestibulology Clinic)

Ethan Paddock, from the National Institutes of Health in Phoenix, and colleagues assessed the ability of 1h-PG and 2h-PG, derived from a 75-g oral glucose tolerance test (OGTT), to predict DR among an American Indian community in the southwestern United States.

One-Hour Plasma Glucose Useful Predictor of Diabetic Retinopathy; The one-hour test is as effective as the two-hour test in its predictive ability