Editing Insulin resistance (section)

===Glucose tolerance testing===
During a [[glucose tolerance test]] (GTT), which may be used to diagnose diabetes mellitus, a fasting patient takes a 75&nbsp;gram oral dose of glucose. Then blood glucose levels are measured over the following two hours.

Interpretation is based on [[WHO]] guidelines. After two hours a [[blood sugar|glycemia]] less than 7.8&nbsp;mmol/L (140&nbsp;mg/dL) is considered normal, a glycemia of between 7.8 and 11.0&nbsp;mmol/L (140 to 197&nbsp;mg/dL) is considered as [[impaired glucose tolerance]] (IGT), and a glycemia of greater than or equal to 11.1&nbsp;mmol/L (200&nbsp;mg/dL) is considered [[diabetes mellitus]].

An [[oral glucose tolerance test]] (OGTT) may be normal or mildly abnormal in simple insulin resistance. Often, there are raised glucose levels in the early measurements, reflecting the loss of a postprandial peak (after the meal) in insulin production. Extension of the testing (for several more hours) may reveal a [[hypoglycemia|hypoglycemic]] "dip," that is a result of an overshoot in insulin production after the failure of the physiologic postprandial insulin response.{{Citation needed|date=October 2010}}