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My recommendation: treat the 28-day rule the same way you treat your pipette calibration schedule
Researchers outside of the US should reference applicable laws
Procedure for a Vitamin B12 Test The test itself is a quick and relatively painless procedure: Sample Collection: A nurse or phlebotomist will clean the area around your arm and draw a small amount of blood from a vein using a needle
David Pope , PharmDchief pharmacy officer, Xifin Pharmacy Solutions, a pharmacy-industry firm
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