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The glucose tolerance test (GTT, not to be confused with GGT test) is a medical test in which glucose is given and blood samples taken afterward to determine how quickly it is cleared from the blood. [1] The test is usually used to test for diabetes, insulin resistance, impaired beta cell function, [2] and sometimes reactive hypoglycemia and ...
Insulin resistance ( IR) is a pathological condition in which cells either fail to respond normally to the hormone insulin or downregulate insulin receptors in response to hyperinsulinemia . Insulin is a hormone that facilitates the transport of glucose from blood into cells, thereby reducing blood glucose (blood sugar).
Fasting prior to glucose testing may be required with some test types. Fasting blood sugar test, for example, requires 10–16 hour-long period of not eating before the test. Blood sugar levels can be affected by some drugs and prior to some glucose tests these medications should be temporarily given up or their dosages should be decreased.
Postprandial glucose test. Changes in blood glucose over time following a high and low glycemic index (GI) carbohydrate. A postprandial glucose (PPG) test is a blood glucose test that determines the amount of glucose in the plasma after a meal. [ 1] The diagnosis is typically restricted to postprandial hyperglycemia due to lack of strong ...
Insulin tolerance test. An insulin tolerance test ( ITT) is a medical diagnostic procedure during which insulin is injected into a patient's vein, after which blood glucose is measured at regular intervals. This procedure is performed to assess pituitary function, adrenal function, insulin sensitivity, [1] [2] and sometimes for other purposes.
The World Health Organization definition of diabetes (both type 1 and type 2) is for a single raised glucose reading with symptoms, otherwise raised values on two occasions, of either: [74] fasting plasma glucose ≥ 7.0 mmol/L (126 mg/dL) or. with a glucose tolerance test, two hours after the oral dose a plasma glucose ≥ 11.1 mmol/L (200 mg/dL)
Impaired glucose tolerance (IGT) is diagnosed with an oral glucose tolerance test. According to the criteria of the World Health Organization and the American Diabetes Association, impaired glucose tolerance is defined as: [13] [14] two-hour glucose levels of 140 to 199 mg per dL (7.8 to 11.0 mmol/L) on the 75-g oral glucose tolerance test.
Glucose homeostasis, when operating normally, restores the blood sugar level to a narrow range of about 4.4 to 6.1 mmol/L (79 to 110 mg/dL) (as measured by a fasting blood glucose test). [ 10 ] The global mean fasting plasma blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); [ 11 ] [ 5 ] however, this level fluctuates throughout the ...