I can't say that an HDL
of 216 is impossible, but I sure have never heard of it. The highest I've heard is around 100.
In theory, such a high HDL means you have almost a 1:1 "clean-up" crew. HDL is like the maid service in your arteries...running around cleaning up after the sloppy tenants (your total Chol). That's why the higher the ratio of HDL to TChol, the easier it is for the "maids" to keep the rooms (your arteries) clean.
That being said, I'd still talk to your doctor about it. Also there are other aspects of cholesterol
that are assuming more and more importance in the study of heart risk. You don't mention what they are, so I can't really determine your risk. It's interesting though.