I had one when I was 18 as a part of a physical for a college that I didn't end up going to. It was probably the most comprehensive physical I've ever had, though. Unfortunately, there was a checklist involved that the doctor had to complete.
I have to agree with Brewmaniac that you answered your own question. If you've got a family history of these things, he's probably just checking to make sure you don't have any early symptoms.
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