January 2014—I read a question and answer in the April 2001 CAP TODAY about platelet clumping on EDTA and whether vortexing is an acceptable procedure. A common solution suggested was to redraw the specimen into sodium citrate or acid citrate dextrose (ACD). How do you calculate the correction factor for blood drawn in an ACD tube? Our lab has an old procedure for ACD correction, and it is to divide the RBC of the EDTA tube by the RBC count of the ACD tube. I don’t have any reference for this and would appreciate information.
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