What does INR with atrial fibrillation mean?

Douglas E. Severance, MD
Family Medicine
International Normalized Ratio (INR) is the blood test used to monitor the thinness or thickness of your blood. If you take warfarin, your doctor will monitor your  INR level at least once a month to make sure you have the proper amount of blood thinner in the body. If INR levels are too low, you are not being protected from blood clots. When the levels are too high, you are protected from blood clots but you are at risk of bleeding. Talk to your doctor about ways to help manage the proper amount of warfarin you are taking.

Continue Learning about Atrial Fibrillation

Atrial Fibrillation

Atrial Fibrillation

Atrial fibrillation -- the most common type of cardiac arrhythmia -- causes an irregular heartbeat that can increase your risk for stroke and heart failure. Atrial fibrillation (AF or AFib) results from faulty signals produced by ...

the heart's electrical system, causing the upper portion of the heart to fibrillate, or contract rapidly and irregularly. AFib doesn't cause noticeable symptoms for everyone. For those who do experience symptoms, heart palpitations are common along with feeling weak, dizzy and tired. Learn more about atrial fibrillation with expert advice from Sharecare.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.