For patients taking warfarin, our clinics offer International Normalised Ratio (INR) testing. Warfarin is an anticoagulant, which slows the body’s production of vitamin K, a key factor in blood clotting. Warfarin is prescribed as a means of preventing blood clots, for patients who have the following conditions:
- Deep vein thrombosis (in which there is a risk of blood clots forming in the veins of the legs)
- Pulmonary embolism (a blood clot in the lungs)
- Atrial fibrillation (a cardiovascular condition which causes irregular heart rate)
Regular testing is required for patients taking warfarin in order to ensure that the medication is working. The INR test monitors the time it takes for your blood to form a clot, with a target range of 2 to 3.
When should I get tested?
Your doctor should advise you regarding the frequency with which you have your INR tested; once you have agreed on a test schedule, it should be rigorously adhered to.
What does the test include
The test involves taking blood, usually from a vein in your arm, near the elbow.