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 #

PROTIME AND INTERNATIONAL NORMALIZED RATIO

Message
Protime/INR: TUBE MUST BE FULL. DO NOT DRAW FROM A HEPARIN LOCK.


Test Code
PTINR


Preferred Specimen
LIGHT BLUE


Minimum Volume
Tube must be full.


Specimen Stability
24 hours


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, short draw tubes, clotted specimens.  Ultracentrifuge grossly lipemic specimens.


Clinical Significance
PT is used to monitor oral anticoagulation therapy of Coumadin and Warfarin, which depresses the liver's production of factors II, VII, IX, and X by a process of copetitive inhibition with Vitamin K.  Since PT measures Factors II, VII, and X, it can be used to monitor the drugs effect.




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.