This test is useful to evaluate a prolonged PT. Deficiency is associated with bleeding risk.
Methodology: Photometric Clot Detection
Specimen Requirements: 1 blue-top (citrate) tube (minumum: the remaining platelet poor plasma separated from 2.7 ml whole blood). Centrifuge blue-top within 60 minutes of collection. Separate plasma and FREEZE immediately. Send specimen frozen in plastic vial. Do not refrigerate.
If using a butterfly collection set, fill a 1 mL waste tube prior to blue-top. This ensures full blood volume in blue-top.
Draw specimen by vacuum.
Hemolyzed specimens are not acceptable.
Tube must be filled to capacity (not overfilled).
If collecting multiple factor studies, draw each factor in separate tube.
Analytical Time: 3 days
Days Set Up: Monday through Friday