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 (PT), Plasma

Test Code
210


CPT Codes
85610

Preferred Specimen

Specimen Type: Whole Blood

Collection Container/Tube: Light-blue top (3.2% sodium citrate)

Specimen Volume: Properly filled 9:1 ratio (blood to anticoagulant); 3.2% NaCitrate tube




Specimen Stability
Ambient Plasma – 28 hours


Reference Range

INR > 5.0



Clinical Significance

The prothrombin time (PT) is a basic coagulation screening test for the assessment of congenital and acquired deficiencies of the extrinsic and common pathways (factors I,II,V,VII, X). The PT is also used to monitor warfarin therapy, Vitamin K deficiency disorders, liver failure, fibrinolysis and DIC. Because of the variations in the PT results with different thromboplastins and instruments, it is recommended that the PT results be converted to an INR.



Performed By
EmpowerMe Diagnostics



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.