Which of the following specimens would be acceptable for platelet aggregation studies?
a. Blood drawn in ethylenediaminetetraacetic acid (EDTA) and kept at room temperature for 6 hours
b. Blood drawn in 3.2% sodium citrate and transported to the laboratory on ice (2° to 4° C)
c. Blood drawn in a serum separator tube
d. Blood drawn in 3.2% sodium citrate and kept at room temperature for 2 hours after drawing
ANS: D
Platelet function studies must be performed within 3 hours of drawing, and the specimen must be kept at room temperature because chilling damages platelets. The blood sample must be drawn in 3.2% sodium citrate.
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