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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.
INR is around 1 (if you check someone who is NOT taking any warfarin/Coumadin), so anyone on Coumadin will be considered high. You want to maintain them within a therapeutic range which is usually maintained between 2-3 or 2.5-3.5 depending on the condition they take the med for.