What colour is blood supposed to be when it goes into the vial during a blood test?

See, I was kind of hoping for fluoro green with sparkles...

No, in all seriousness, is it supposed to be dark maroon? It's always been closer to a red in past tests.
Does it really matter?
Huh. I always thought oxygenated blood was red and deoxygenated blood was blue.
Perhaps that's a misconception of mine.
 
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