Oh wow, you're going so far as getting your sweat content analyzed? That's pretty darn cool. What kind of facility are you getting this performed at? Doesn't sound like something you'd typically get done at the local hospital.

Even so, it's still a simulated environment. And sweat composition varies over time for various reasons, like from off-season into peak shape, or from cooler months into hotter months, so it's still an approximation. But very interesting.