A 53-year-old female asked:
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i just got a call to stop taking my warfarin because i had a "critical inr" this morning. what does that mean?

3 doctor answers
Dr. Peter Corrado
41 years experience Family Medicine
Level is too high: Inr tells us how effectively your warfarin is thinning your blood. Generally a level between 2.0 and 3.5 is considered ok depending on the problem. If it gets too high, the risk of bleeding increases and adjustment of the dose is needed. In some cases, stopping the drug is needed temprarally, to reduce the inr before restarting the warfarin at a new dose.
Answered on Jun 7, 2015
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Dr. Benjamin Lerner
19 years experience Vascular Surgery
INR too high: Your inr is above a certain level (in my hospital, it is 4.5) where there is a concern over bleeding.
Answered on Mar 19, 2013
Dr. John Sampson
32 years experience Anesthesiology
Critical INR: This means that the warfarin in your body is blocking your ability to make a blood clot to the point that you are at risk of bleeding. You could start bleeding a dangerous amount from a minor fall or bump or even start spontaneously bleeding. The spontaneous bleeding could take place internally, which would be very dangerous. Follow your doctor's instructions.
Answered on Sep 28, 2016

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