Your doctor's advice seems sound as long as he addressed your specifics with a thorough history, e.g. symptoms, family/personal history of any GI bleeding such as ulcers or colon cancer. If you are over 55/60 or a male and eat a nutritionally sound diet, a steadily decreasing HGB will be most likely due to GI system issues. But this one value can't really tell you anything. Unless you are having or develop some symptoms (weakness, increased fatigue, pale mucous membranes, dark/tarry stools) or this is really going to prey on your mind, waiting 3 months should be fine. Otherwise, go back to your doctor and tell him you need a little more investigation done at this point - repeat the test and at least do a stool sample for occult blood.
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