The oral glucose tolerance test (OGTT) measures the body's ability to use a type of sugar, called glucose, that is the body's main source of energy. An OGTT can. A glucose tolerance test measures how well your body is able to process glucose, or sugar. Your doctor can use it to diagnose diabetes. Overview · Preparation · Procedure. An increasingly popular method for measuring blood glucose is to sample capillary or finger-prick blood, which is less History · Testing · Results. From Wikipedia, the free encyclopedia. In the three-hour version of the test, a healthcare provider will ask you to consume a syrupy glucose solution that contains grams of sugar. You will drink 50 grams of glucose. No other testing will be done to diagnose gestational diabetes. HOMA-IR homeostatic model assessment is a convenient way of measuring insulin resistance in normal subjects, which can be used in epidemiological studies, but can give erroneous results for diabetic patients. Have previously given birth to a baby who weighed more than home logo png lb 4. Further blood samples will then be taken either at regular intervals of say 30 or 60 minutes or a single test after 2 hours.