On Wednesday, September 23, 2015 at 2:26:02 PM UTC-5, Don Y wrote:

If I know they will be drawing blood, I'll drink plenty of fluids
and be properly hydrated *before* going to the office/lab. It's
the "spur of the moment" sort of tests that usually result
in the fishing expeditions ("Gee, we haven't done a CBC in 3 years!
Why don't we get that, today?")

Isn't that a small amount for a blood draw? When you give blood they take 4 or 5 vials prior to filling the bag. Isn't that like a blood draw?