A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Prothrombin Time

Test Code
LAB320


Alias/See Also
INR
PT
Protime


CPT Codes
85610

Preferred Specimen
3 mL plasma collected in 3.2% sodium citrate (light blue-top) tube


Minimum Volume
3 mL plasma collected in 3.2% sodium citrate (light blue-top) tube


Other Acceptable Specimens
5 mL whole blood collected in sodium citrate (light blue-top) tube


Instructions
If specimen will be delayed please send as Platelet Poor Plasma: Centrifuge light blue-top tube 15 minutes at approximately 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 ship on dry ice.


Transport Temperature
Room Temperature


Specimen Stability
Room Temperature: 4 hours
Frozen: 2 weeks platelet poor plasma




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.