What does "High INR" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"High INR" refers to a situation where the blood is taking longer than usual to clot or thicken. INR, or International Normalized Ratio, is a measure used to determine how quickly a person's blood clots. If the INR is high, it means the blood is thinner and takes longer to clot, which can increase the risk of bleeding.
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