Coumadin is an anticoagulant. It increases the time it takes for your blood to clot. Coumadin can cause you to be more prone to bleeding, so it is very important for you to have just the right amount of Coumadin in your body.
To make sure your Coumadin level is in the therapeutic range a blood test call INR is done on a regular basis.
Most people have a normal INR of around 1.0. It's really not necessary to remember exactly what the letters stand for--I think it's International Normalized Ratio, so that wherever you go in the world, the numbers will be the same, so that everyone is on the same page when the numbers come in.
Usually while on Coumadin therapy, the INR should be between 2 and 3. Occasionally the range should be 2.5 to 3.5. Many things can affect the INR; antibiotics for one, and an increase or decrease in consumption of green, leafy vegetables. Patient's on Coumadin need very good education, stressing the importance of their periodic INR draws. Too high of an INR can lead to bleeding, etc..., and too low of an INR can results in clots.
Generally a dose to maintain an international normalised ratio (INR) of 2-3 is the goal for people like Nanners who have been dx with Atrial Fib. However I am not a Dr. and I do not know what Nanner's range is suppose to be.
Just my own info on the use of Coumadin FYI.
Kindly,
Kitt