Hemostasis Flashcards
Errors that requires rejection
Short draw
Specimen clot
Visible hemolysis
Lipemia or icterus
Tourniquet app. >1 min
Specimen storage
Whole blood volume _________ of require volume submit to rejection
<90%
Short draw results to
PT and PTT falsely increased
A small clot interferes with ______________
Hemostasis test interference
Pink or Red plasma indicates ____________ of platelets and coagulation
In vitro activation
Hemolysis interferes with _______________
Optical endpoint coagulometer results
Lipemia or icterus interferes with ________
Chromogenic substrate methods
Tourniquet more than 1 min elevates
Concentration of VWF and fibrinogen
Tourniquet more than 1 min shorten
Platelet integrity
Refrigerator temperature causes
Precipitation of large VWF multimers
Activation of coagulation F7 and platelets
Destruction platelet integrity
Storage at >25 degC causes
Deterioration of F5 and F8
PT with no UFH stability
24 hours
PTT with no UFH stability
4 hr
Factor assay and whole blood aggregometry stability
4 hr
PTT for monitoring UFH
Separate for 1 hr, test within 4 hr
PT when UFH is present
Test for 4 hr, separate within 1 hr
Optical platelets aggregometry stability
Wait for 30 mins, test within 4 hrs
Stability if stored in household freezer
2 weeks
Temperature storage for about 6 months or indefinite
-70degC
