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Test Code PT Prothrombin Time w/ INR

Important Note

Deliver to the lab within 24-hours of collection

Specimen Information

Obtain specimen using standard phlebotomy techniques.

No special patient preparation is necessary.

 

Container Specimen Temperature Collect Vol Submit Vol Min Vol Stability
Blue Top Tube Whole Blood Ambient To fill line To fill line To fill line 24 hours
Blue Top Tube Plasma Frozen To fill line 2.0 mL Plasma 0.5 mL Plasma 6 months

 

Reject Due To:

- Above criteria not met

- Marked hemolysis

- Specimen unlabeled or mislabeled

- Tube under or overfilled.

 

Tubes must be filled to the fill line.

Instrumentation / Method

ACL TOP 350 CTS / Photo Optical Clot Detection

Test Schedule / Analytical Time / Test Priority

Daily / Same Day / Available STAT

Reference Range

10.2 - 12.9 Seconds

INR value valid only on patients on stabilized warfarin therapy.  The recommended therapeutic range for warfarin (Coumadin) for most clinical indications is an INR of 2.0-3.0.  An INR of 2.5-3.5 is recommended for patients with mechanical heart valves.

 

Critical Value(s):

INR: >4.0

CPT / LOINC / Order Code

 

Meditech Medent LOINC CPT
PT PT 5902-2 85610
INR   6301-6