INR Test – Reference Range

The normal range for a healthy person not using warfarin is 0.8–1.2, and for people on warfarin therapy an INR of 2.0–3.0 is usually targeted, although the target INR may be higher in particular situations, such as for those with a mechanical heart valve.

While PT stands for prothrombin time, INR is the abbreviation for international normalized ratio. INR provides a standard score for the PT test that is clear no matter which method is used or what lab does the analysis.

An INR test is run to monitor the performance of blood-clotting medication such as warfarin. It is also used to help determine the reason for bleeding or bruising, monitor liver function and investigate blood disorders.

Keywords: INR; Pro Time; Prothrombin Time and International Normalized Ratio; Prothrombin Time and International Normalized Ratio (PT/INR); Protime; PT

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.