Prothrombin Time 1:1 Mix
|Indications||ORDERED BY LAB AS A REFLEXIVE TEST ONLY|
|Test Information||The prothrombin time is performed using a 1:1 mix of patient plasma with normal plasma. Lack of prothrombin time correction with the 1:1 mix indicates the presence of a coagulation inhibitor. If the prothrombin time is abnormal and etiology unclear, the testing will reflex to this test.|
|Additional Test Information||Normal ranges are included on testing report and can be made available upon request.|
|Sample Requirements||Whole Blood: 3.2% sodium citrated (blue top) OR
|Requested Volume||Two 5 ml 3.2% sodium citrated (blue top) tubes as whole blood OR
frozen plasma in 4 X 1mL aliquots in plastic tubes.
|Sample Information||Whole blood is preferred for testing, but if it is not possible to send whole blood tubes TO ARRIVE HERE within 2 hours of collection, then send frozen plasma. To prepare plasma, centrifuge blue top tubes at 1500g for 15 minutes and remove the plasma and centrifuge a second time at 1500g for an additional 15 minutes. Aliquot approximately 1 ml of plasma into 4 plastic tubes, and freeze.|
|Shipping Information||Whole Blood: Send at ambient temperature (18-25°C) and must be received within the lab in less than or equal to 2 hours after collection.
Frozen Plasma: Send on dry ice
Send samples to:
For additional information, please see Ordering Information.
|Requisition Form||RFT- Hemostasis Reference Laboratory|
|Turn around Time (analytic time)||3 Business Days|
|Report/Results||Fax number required to receive report|