Yes, 7.4 is a very high level for INR!
Normally (in 95% of healthy adults) it should range between 0.8 and 1.3. However, in people taking warfarin a normal INR level is somewhere between 2 and 3.
High levels of INR are associated with: Disorders affecting clotting factors; Warfarin usage; Vitamin K deficiency; Liver disease; Disseminated intravascular coagulation etc.
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It is not dangerous. But the normal range is between 2 to 3. If inr level goes below 1 then it is dangerous. It will cause fix. Also it should not be more than 4. If it goes above 4 it will thinner your blood. Bleeding will be more for ladies. Warf tablets can increase inr. If your count is between 1.5 to 2 then uou can take warf 6 after consulting your doctor. For ladies after delivery inr may between 1.4 to 2 in some special cases. They can also take warf. They can feed their babys too.
An INR of 7.0 is dangerous as it indicates too much thickness of the blood that can lead to blood clots. An ideal INR reading is 2.5 to 3.0.