PT/INR test
About This Test
A PT/INR testmeasures how long it takes blood to clot, with PT (Prothrombin Time) tracking seconds and INR (International Normalized Ratio) standardizing the result for accuracy across labs. A normal INR is 1.1; For patients on blood thinners like Warfarin , the target is usually 2.0 to 3.0. This test is crucial for monitoring anticoagulant therapy, liver function, and pre-surgical screening.