What anticoagulant agent is used most often in the hematology laboratory?
a. 3.2% Sodium citrate in the purple top
b. EDTA in the purple top
c. 3.2% Sodium citrate in the blue top
d. Heparin in the green top
ANS: B
EDTA is the anticoagulant agent of choice for routine hematology testing; it is found in the purple top tube. For routine coagulation testing, 3.2% sodium citrate in the blue top is used, whereas heparin in the green top tube is used for some special tests, primarily in clinical chemistry.
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