Glucose Tolerance Test, 6 Specimens - This test is used for the routine diagnosis of diabetes in children and the non- pregnant adult. For pregnant females use test code 6745. For appropriate interpretation of this test, the patient must fast overnight and ingest a 75 g load of glucose, immediately after a fasting specimen is obtained. (for children, the glucose load is 1.75 g/kg of body weight, up to 75). The diagnosis of diabetes is made if glucose exceeds 200 mg/dL in the 2 hour specimen and in any preceding specimen.