|Also Known as (Alias)||PTT|
|Indications||Prolonged aPTT in a patient suspected of receiving heparin or having had blood drawn through a heparinized catheter or port.|
|Test Information||Therapeutic anticoagulation interferes with most kinetic (but not DNA) tests. For specimens suspected of containing heparin, heparin is adsorbed using Hepzyme (Dade) reagent and the aPTT repeated.|
|Additional Test Information||If sample undergoes heparin removal, this test is ordered by lab. 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|
|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 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|
|Test Schedule||Monday – Friday|
|Turn around Time (analytic time)||3 Business Days|
|Report/Results||Fax number required to receive report|