@bigjim - You're absolutely right about that. People don't appreciate everything their kidneys do for them until they start to have problems with them, and then it can be too late.
I never bothered to get lab work when I was younger, I figured I was healthy and didn't want to "waste my time", as I put it then. When I finally did go it turned out that my creatinine ratio and a bunch of other labs were off, and I nearly ended up on dialysis. I am really glad I got it checked out before it was too late.