<prompt> Which of the following is not a test for diabetes mellitusFasting blood glucoseRandom blood glucoseD-Xylose testOral Glucose tolerance test  <response>: Answer is C D-Xylose test: The D-Xylose test is a test for assessment of proximal small intestinal mucosa fUnction. D- Xylose test is used to assess carbohydrate malabsorption and is not a test for assessment of Diabetes mellitus Fasting blood glucose, Random blood glucose and Oral Glucose Tolerance test are all used for assessment of diabetes mellitus. Criteria for the diagnosis of Diabetes Mellitus Symptoms of diabetes plus random blood glucose concentration 11.1 mmolL 200 mgdL or Fasting plasma glucose 7.0 mmolL 126 mgdL or Two-hour plasma glucose 11.1 mmolL 200 mgdL during an oral glucose tolerance test. 