A prothrombin time (PT or PT/INR) test measures how quickly your blood clots. The results may be in seconds or, more commonly, a calculation called the International Normalized Ratio (INR).

Nov 17, 2025 · The typical Prothrombin Time (PT) reference range for a healthy adult is between 11.0 and 13.5 seconds. This range reflects the expected speed at which the blood sample …

If you are not taking warfarin and your INR or prothrombin time results are not normal, it may be a sign of that your blood is not clotting normally. If your PT/INR levels are too low, your blood is …

Jan 19, 2024 · Find out what PT/INR and PTT blood tests are, what the results mean, and how what you do can affect the outcomes of these blood tests.

Dec 3, 2024 · Most often, prothrombin time is monitored if you are taking the blood-thinning medicine warfarin. In this situation, the prothrombin time is shown as an international …

Aug 21, 2025 · Decipher normal INR levels and target ranges. Understand how to monitor and maintain your blood clotting for better health.

A normal PT-INR range for people who take warfarin is 2-3 but can vary from patient to patient. Patients who tend to clot more easily may have an INR target range of 3-4.

Jul 19, 2025 · This article dives deep into what the PT INR test measures, its normal ranges, influencing factors, and why you should consider regular monitoring through reliable diagnostic …

Sep 23, 2025 · The normal INR range for individuals not on anticoagulation therapy is 0.9-1.1, with an INR above 1.5 considered discoagulopathy that significantly increases bleeding risk. 1.

The prothrombin time (PT) – along with its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) – is an assay for evaluating the extrinsic pathway and …