PT INR (Prothrombin Time)

A PT INR (Prothrombin Time) (PT/INR) test helps detect bleeding disorders and monitor the treatment if you are on blood-thinning medicines, such as warfarin. This test also helps to detect liver diseases or check for clotting function before planning surgery.

Prothrombin is a protein and type of clotting (coagulation) factor made by the liver. It helps stop bleeding in case of injuries by forming blood clots. A prothrombin time (PT) helps detect and diagnose a bleeding disorder or an excessive clotting disorder, while the international normalized ratio (INR) is calculated from a PT result and is used to monitor how well blood-thinning medication (anticoagulant), such as warfarin, is working to prevent blood clots.

A PT INR (Prothrombin Time) test can be done if you have symptoms of bleeding or clotting disorders, such as unexplained heavy bleeding, easy bruising, unusual heavy nose bleeds, leg swelling, redness on the legs, or chest pain. Usually, overnight fasting (8-12 hours) is preferred before a PT/INR test, and a duly-filled coagulation requisition form is mandatory for sample collection. 

Test result ranges are approximate and may differ slightly between different labs depending on the methodology and laboratory guidelines. Talk to your doctor about your specific test results. Narrate your complete medical history to help the doctor correlate your clinical and laboratory findings. The test results will help them determine your medical condition, make recommendations for lifestyle modifications such as diet and exercise, decide whether or not medication will be required to manage your condition, and formulate your overall treatment plan.