The glucose tolerance 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. The test is usually used to test for diabetes, insulin resistance, impaired beta cell function, and sometimes reactive hypoglycemia and acromegaly, or rarer disorders of carbohydrate metabolism. In the most commonly performed version of the test, an oral glucose tolerance test (OGTT), a standard dose of glucose is ingested by mouth and blood levels are checked two hours later. Many variations of the GTT have been devised over the years for various purposes, with different standard doses of glucose, different routes of administration, different intervals and durations of sampling, and various substances measured in addition to blood glucose.
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http://cardiab.biomedcentral.com/articles/10.1186/1475-2840-11-21 postchallenge responses of nitrotyrosine and tnf-alpha during 75-g oral glucose tolerance test are associated with the presence of coronary artery diseases in patients with prediabetes by chih-sheng chu et al., cardiovascular diabetology201211:21 doi: 10.1186/1475-2840-11-21
http://europepmc.org/backend/ptpmcrender.fcgi?accid=pmc4552828&blobtype=pdf van valkengoed igm, vlaar ema, nierkens v, middelkoop bjc, stronks k (2015) the uptake of screening for type 2 diabetes and prediabetes by means of glycated hemoglobin versus the oral glucose tolerance test among 18 to 60-year-old people of south asian origin: a comparative study. Plos one 10(8): e0136734. Doi:10.1371/journal.pone.0136734
https://www.hindawi.com/journals/jobe/2010/741521/ kamran qureshi, ronald h. Clements, fahad saeed, and gary a. Abrams, “comparative evaluation of whole body and hepatic insulin resistance using indices from oral glucose tolerance test in morbidly obese subjects with nonalcoholic fatty liver disease,” journal of obesity, vol. 2010, article id 741521, 7 pages, 2010. Doi:10.1155/2010/741521
http://europepmc.org/backend/ptpmcrender.fcgi?accid=pmc4186853&blobtype=pdf : lind m, tuomilehto j, uusitupa m, nerman o, eriksson j, et al. (2014) the association between hba1c, fasting glucose, 1-hour glucose and 2-hour glucose during an oral glucose tolerance test and cardiovascular disease in individuals with elevated risk for diabetes. Plos one 9(10): e109506. Doi:10.1371/journal.pone.0109506