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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 ...
A level below 5.6 mmol/L (100 mg/dL) 10–16 hours without eating is normal. 5.6–6 mmol/L (100–109 mg/dL) may indicate prediabetes and oral glucose tolerance test (OGTT) should be done for high-risk individuals (old people, those with high blood pressure etc.). 6.1–6.9 mmol/L (110–125 mg/dL) means OGTT should be done even if other ...
After two hours a glycemia less than 7.8 mmol/L (140 mg/dL) is considered normal, a glycemia of between 7.8 and 11.0 mmol/L (140 to 197 mg/dL) is considered as impaired glucose tolerance (IGT), and a glycemia of greater than or equal to 11.1 mmol/L (200 mg/dL) is considered diabetes mellitus.
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)
The metabolic response to a carbohydrate challenge is conveniently assessed by a postprandial glucose level drawn 2 hours after a meal or a glucose load. In addition, the glucose tolerance test, consisting of several timed measurements after a standardized amount of oral glucose intake, is used to aid in the diagnosis of diabetes. [citation needed]
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. A patient is said to be under the condition of IGT when he/she has an intermediately raised glucose level after 2 hours, but less than the level that would qualify for type 2 diabetes mellitus. The fasting glucose may be either normal ...
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