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Prothrombin Time w/INR (PT/INR)
Test CodePTINR
Preferred Specimen
Plasma, Full Tube Draw
Instructions
Indicate time of last Coumadin dose.
Transport Container
Light Blue top
Transport Temperature
Specimen stable for 24 hours if at room temp. or refrigerated, spun or unspun, and must remain capped.
Reference Range
See report for normal ranges. Critical Value: INR >6.0 sec (<1.4 if anticoag hx provided)
Clinical Significance
The PT/INR assay is intended to screen for abnormalities of the coagulation proteins involved in the extrinsic and common pathways. It is commonly used to monitor patients on oral anticoagulant (Coumadin) therapy.