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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.
If the person is not on Coumadin, 1.7 is high. If he's on Coumadin, 1.7 is not high enough. But, some docs won't do tests on anyone with a higher than normal INR because the increased risk for bleeding is still there. But a 1.7 isn't that big a deal; some docs just use extra caution.