This will sound wierd, but I knew a rancher who could diagnose a calf (correctly, confirmed by a vet) based on those two things. Ironically, he had been developing diabetes, which had he been paying as close attention to waste products he might have caught sooner.

PSA: Look before you flush, it's actually not a bad way to gauge general health.

Maybe a little weird, but certainly not surprising to me.

It's the closest you can get non-invasively to looking inside yourself.

Can I get weirder? What lab assessment material should I procure - as a consumer - to evaluate the most significant characteristics of my wastes?

Your nose and eyes is sufficient lab equipment.