|Also Known as (Alias)||PTT|
|Test Information||The aPTT is performed using a 1:1 mix of patient plasma with normal plasma. Lack of aPTT correction with the 1:1 mix indicates the presence of a coagulation inhibitor. Shortening of the aPTT upon the 1:1 mix to the normal range indicates coagulation factor deficiency or a factor inhibitor that requires incubation for detection. If aPTT is abnormal, the testing will reflex to this test.|
|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
|Minimum Volume or Pediatric volume||Frozen Plasma: at least 0.5ml in 2 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 3 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 (18-25C) and must be received within the lab in less than or equal to 3 hours after collection.
Frozen Plasma: send on dry iceSend samples to:
For additional information, please see Ordering Information
|Requisition Form||RFT- Hemostasis Reference Laboratory|
|Test Schedule||Monday – Friday|
|Turn around Time (analytic time)||1 Business Day|
|Report/ Results||Fax number required to receive report|
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