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: PTT is recommended for screening ONLY, and should NOT be used for heparin monitoring.
Plasma Citrate (Light Blue Top)
Ambient 4 Hours
Frozen 14 Days
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