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Protime (PT) with International Normalized Ratio (INR)

Message
Suggested values for INR for prophylaxis of venous thrombosis and for treatment of deep vein thrombosis or pulmonary embolus are 2.0-3.0, while values suggested for prevention of recurrent embolism or treatment of patients with mechanical prosthetic heart valves are 2.5-3.5. Day(s) Test Set Up: Monday through Sunday


Test Code
PTI


CPT Codes
85610

Instructions
Draw a full, light blue-top (302% 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 (302% sodium citrate) Tube


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


Methodology
Optical Density

Reference Range
Due to lot to lot variation, call lab for current reference range; Alarm Value: 50.0 seconds; INR Normal: 0.8-1.2 seconds


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



Last Updated: November 4, 2010


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.