Collection Notes: Draw to the proper fill level (do not overfill or underfill) because the correct ratio of blood to citrate is critical (9:1). Mix by gentle inversion 5-6 times. Hemolyzed or clotted specimens are not acceptable. Centrifuge and physically separate the plasma using a plastic transfer pipette into a separate plastic transfer tube, Freeze and transport frozen.
Clinical Utility: The measurement of PT is the method of choice for monitoring anticoagulant therapy with vitamin K antagonists (warfarin-type oral anticoagulant drugs, e.g., Coumadin), especially for preventing post-operative thrombosis and pulmonary embolism, and to screen for coagulation factor deficiency in hemorrhagic diseases.
Plasma Citrate
(Light Blue Top)
Ambient 24 Hours
Frozen 14 Days
Plasma pour off
(Light Blue Top)
Ambient 24 Hours
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