The range of 70-126 is considered normal before eating a meal, or as a fasting glucose
level. So although the one test
at slightly above 200 does seem suspect, one test
alone is probably not something your doctor would base a diagnosis on.
Most doctors will do a fasting glucose reading, perhaps a glucose tolerance test, or perhaps a hemoglobin a1c test, which would show the average glucose level in your body during a 3-month period.