<prompt> Answer this question truthfullyCould you please explain what a glucose tolerance test is?  <response>: <reason> Fasting plasma glucose should be below 6.1 mmoll 110 mgdl. Fasting levels between 6.1 and 7.0 mmoll 110 and 126 mgdl are borderline impaired fasting glycaemia , and fasting levels repeatedly at or above 7.0 mmoll 126 mgdl are diagnostic of diabetes.The 2 hour glucose level should be below 7.8 mmoll 140 mgdl. Levels between this and 11.1 mmoll 200 mgdl indicate impaired glucose tolerance. Glucose levels above 11.1 mmoll 200 mgdl at 2 hours confirms a diagnosis of diabetes. 