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PROTHROMBIN TIME

Message
If the specimen is not  sent to the Piedmont Lab within12 hours of collection, spin and freeze platelet free plasma. Note citrated plasma on the pour off tube. See instructions below.


Test Code
PT.


Alias/See Also
LAB320 PROTIME - INR 80815


Includes
Includes: INR


Preferred Specimen
Light blue top tube (Citrated blood 9:1 (blood to anticoagulant) 3.2% sodium citrate)


Minimum Volume
Full tube, no partial fills.


Instructions
Centrifuge light blue-top tube 15 minutes at approx. 1500 x g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets (< 10,000/mcL). Freeze immediately and sent frozen to Piedmont Lab.


Specimen Stability
24 hours room temperature


Performed By
Piedmont Atlanta



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.