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What are dangerous INR levels?

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Quick Answer

Most experts believe that International Normalized Ratio levels above 4 are dangerous, according to INRTracker. Normal INR levels in healthy individuals are usually between 0.9 and 1.3.

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Full Answer

Patients on blood thinners such as Warfarin are expected to have INR levels ranging from 2 to 3; however, some doctors prefer levels ranging from 2.5 to 3.5, INRTracker reports. INR levels at or above 5 often require a dose of vitamin K, the antidote for Warfarin, to bring the level down.

INR levels are a measurement of how long blood takes to clot; bleeding risk increases when INR levels are high, INRTracker explains. Various factors affect INR levels, including the amount of dietary vitamin K the patient consumes. Doctors usually advise patients who are taking Warfarin to ingest the same amount of green leafy vegetables, which are high in vitamin K, every day.

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