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PROTHROMBIN TIME WITH INR

 
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Description
 

CPT Code(s)

85610

Methodology

Photo-optical Clot Detection

Limitations

Expected impact by therapeutic levels (potential interference depends upon drug concentration): Warfarin: prolonged; Heparin (UFH or LMWH): little to no effect (reagent contains a heparin neutralizer); Dabigatran or Argatroban (Thrombin Inhibitors): normal to prolonged; Rivaroxaban or Apixaban (Factor Xa Inhibitors): prolonged.

Reference Range(s)

PT9.0-11.5 sec
INR
Reference range0.9-1.1
Moderate - intensity Warfarin therapy2.0-3.0
Higher - intensity Warfarin therapy3.0-4.0

Clinical Significance

Screening test for abnormalities of coagulation factors that are involved in the extrinsic pathway. Also used to monitor effects of Warfarin therapy and to study patients with hereditary and acquired clotting disorders.

Test FAQ

Prothrombin Time with INR

Alternative Name(s)

PT


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