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Protime (PT) with International Normalized Ratio (INR)

Test Code
PTX


CPT Codes
85610

Instructions
Draw a full, light blue-top (3.2% sodium citrate) tube. Invert several times to mix blood. Avoid hemolysis. Note: Stability is 24 hours at RT if unopened.


Transport Container
Light Blue Top (3.2% sodium citrate) Tube


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Clotted blood


Methodology
Optical Density

Reference Range
9.7-11.7 seconds Critical Value: 40.5 seconds INR Normal: 0.93-1.17


Clinical Significance
Useful for evaluating extrinsic coagulation pathway and monitoring oral anticoagulant therapy.




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.