The most common glucose tolerance test is the oral glucose tolerance test (ogtt). before the test begins, a sample of blood will be taken. you will then be asked to drink a liquid containing a certain amount of glucose (usually 75 grams). your blood will be taken again every 30 to 60 minutes after. In the oral glucose tolerance test the patient, after fasting for 15 hours, drinks 75 g of glucose in 300 ml of water, over 5 minutes. blood glucose is measured before the drink and after 30, 60, 90 and 120 minutes. urine is collected before the drink, and after 60 and 120 minutes. before the test. Why it’s done. the glucose tolerance test identifies abnormalities in the way your body handles glucose after a meal — often before your fasting blood glucose level becomes abnormal..

A glucose tolerance test measures how well your body is able to process glucose, or sugar. your doctor can use it to diagnose diabetes.. Diagnosis. according to the criteria of the world health organization and the american diabetes association, impaired glucose tolerance is defined as:. 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.. Indications. the glucose tolerance test is used in the diagnosis of diabetes, impaired glucose tolerance, insulin resistance and reactive hypoglycaemia.please note:.

The one hour oral glucose challenge test [gct] is a screening test for gestational diabetes that measures plasma or serum glucose concentration 1 hour after a 50-g oral glucose load.. The 3 hour ogtt is a diagnostic test for gestational diabetes. it measures glucose concentrations over three hours after a 100-g oral glucose load.. Impaired glucose tolerance (igt) is diagnosed using the oral glucose tolerance test (ogtt). find out about how impaired glucose tolerance is diagnosed..

The 3 hour ogtt is a diagnostic test for gestational diabetes. it measures glucose concentrations over three hours after a 100-g oral glucose load.. In the oral glucose tolerance test the patient, after fasting for 15 hours, drinks 75 g of glucose in 300 ml of water, over 5 minutes. blood glucose is measured before the drink and after 30, 60, 90 and 120 minutes. urine is collected before the drink, and after 60 and 120 minutes. before the test. Indications. the glucose tolerance test is used in the diagnosis of diabetes, impaired glucose tolerance, insulin resistance and reactive hypoglycaemia.please note:.