No, it's all a bit arbitrary at the moment, but the more blood they take out of you, the more they are likely to find wrong.
Big thing at the moment in the UK is the "CKD" (Chronic Kidney Disease) "register."
You may visit your GP with a sore toenail, (or whatever), and could end up on one of these things.
CrazyScientist, the flush of youth will probably let you get away with it. I have no idea about the physiology of protein metabolism, I'm sure some of my learned friends could fill you in. If you overload the system, then some will inevitably leak out (picked up on dipstick). That will then cause you, and your AME, another hurdle.
thebdct it's in my car at the moment, which is a crap excuse. If you have access to last years "Red Whale" or "CKS" it's worth a look. The whole protein/kidney stuff is worrying. Most sensitive stuff at the mo is eGFR and PCR/ACR. But watch this space :-)
But why load the odds at this crucial point ?