INR is "International normalized ratio": it is a test for blood coagulation.
The INR has basically replaced the prothrombin time, or PT.
The INR test measures how quickly your blood clots while on Warfarin. A high INR indicates slower clotting time. However, factors like a vitamin K-rich diet, certain medications, or medical conditions can affect how Warfarin works, leading to clots despite high INR levels.
INR
Blue
vary according to age and sexual maturity. The phase of a woman's menstrual cycle or use of birth-control pills also affects test results.
PT/PTT and INR
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A PT INR test would be used if someone is suspected of having bleeding problems. It is also used to check or diagnose blood related problems (blood clotting).
Acetaminophen can increase the results of your INR, meaning your blood would be thinner. You should consult with your physician regarding Tylenol usage as the frequency of testing your PT/INR may need to be increased. However, Tylenol generally has a limited effect on INR's. Consuming the maximum dosage of 4g (4000mg) generally effects the INR very little.
PT and INR lab test.