On a fasting glucose test, the normal blood sugar range for someone without diabetes is from 70 to 99 milligrams per deciliter, according to MedlinePlus. Results vary somewhat with random blood glucose tests, but normal results are typically less than 125.
With a fasting test, results from 100 to 125 milligrams per deciliter suggest pre-diabetes, advises MedlinePlus. Diabetes is indicated by levels above 125. A score of 200 or more on the random test is also a sign of diabetes; however, an elevated blood glucose level is sometimes caused by an overactive thyroid gland, pancreatic cancer, pancreatic inflammation, stroke, heart attack, surgery or certain tumors.