> It ought to be relatively easy. ... Seems like a fairly trivial experiment to run and reproduce.
That depends on what you're testing. "Blood test" and "health test" are ridiculously ambiguous terms. Something like red blood cell counts don't vary much from day to day, but some things, like blood sugar and cortisol, vary hour to hour.
That depends on what you're testing. "Blood test" and "health test" are ridiculously ambiguous terms. Something like red blood cell counts don't vary much from day to day, but some things, like blood sugar and cortisol, vary hour to hour.