Heart Disease Home > INR
Interpreting the International Normalized RatioTypically, a healthy person who is not taking a blood-thinning medicine will have an INR of about 1 (the usual range is from 0.8 to 1.2). A person taking warfarin will generally have a higher INR value. As the warfarin dosage is increased, a person's INR should also increase. The higher the INR, the longer it takes the blood to clot. This can help prevent blood clots that may lead to strokes. However, if the INR is too high, there is a risk for uncontrolled bleeding.
- 2 to 3 -- the typical range for most "blood-thinning" needs
- 2.5 to 3 -- the desired range for people who have a high risk for developing a blood clot.