Maybe: There are simple screening liquids that blood centers use to screen for eligibility for donation. If your crit is high enough then the drop of blood sinks. Don't know if you can get a hold of that liquid.
Answered 2/2/2013
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
5 doctors weighed in across 2 answers
A doctor has provided 1 answer
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