Module 4 pre analytical variables Flashcards
what is hemolysis
damaged to RBC allowing escape of RBC causing plasma/serum to appear pink
prevention of hemolysis
non traumatic collection, appropriate needle gauge, proper tube mixing, gentle specimen handling
what is hemoconcentration
false increase in cellular or mineral content of specimen
prevention of hemoconcentration
under one minute for tourniquet. patient should not pump fist
what is hematoma
bruising
prevention of hemotoma
needle positioning, post phlebotomy care- pressure on puncture site. avoid probing
underfilling of tube causes
dilution effect
overfilling of tube causes
potential of clotting
what is addictive contamination
tubes are drawn out of draw
what is mixing error
too vigorous can cause hemolysis. not inverted enough causes clotting
prevention for mixing error
follow prescribed inversions and mixing immediately
problems with intravenous infusion sites
IV fluid contaminate and dilute specimen. plus can damage IV site
prevention of intravenous infusion sites
do other arm, turn of IV and wait or below IV site never above
what is tissue thromboplastin contamination
a clot initiating substance. damage to vessel will cause substance to be taken up into tube
what to do with tissue thromboplastin contamination
discard tube
