How do you FEEL?: If you're a reasonably well-muscled young man, that creatinine is normal. The GFR's estimates are subscientific; I believe they've been added to make people think they need to take unnecessar medicines. There's even a racial adjustment "because black people are more muscular." When I was lifting weights daily, I was suddenly a kidney case. I'm not and I bet you are not either.
Answered 11/28/2017
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