I know that a large part of how doctor's can diagnose what is happening with our bodies, or at least how they do it at this point in time, is to analyze your blood. What they don't tell you when your doctor schedules a bunch of different tests is that each one is going to require it's own vial of blood. Now, in theory, I imagine the diagnostics lab could probably get all of the information it needed from one vial but because they don't want to mix up test results, etc. they separate out everything like that.
When you sit at the chair and watch the technician take 9 vials though, that's when your thoughts turn to things like why isn't modern medicine more like Star Trek yet?
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Back in the Middle Ages they bled people to make them well. It appears that they do that same thing today:)
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