PandFeb, I can't be sure about this, and different PPs may do this differently, but I agree with you that diagnosed diabetics are not referred to an endocrinologist, nor are they made to do HbA1C tests, or fasting glucose tests, since those are basically a diagnostic tool. My PP asked me to do a serum creatinine and not either of the other two tests since I do them every 3 months anyway and already have a diagnosis. If the serum creatinine is abnormal, generally you should be referred to a kidney specialist and not an endo. I think since you had not been diagnosed before, you were referred to an endo to give a diagnosis, which seems a bit of an overkill because any doctor can diagnose diabetes, and mostly only Type 1s go to endos.