INR is "International normalized ratio": it is a test for blood coagulation.
The INR has basically replaced the prothrombin time, or PT.
INR
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.
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PT/PTT and INR
It is usually recommended to fast for 8-12 hours before an INR test to avoid inaccurate results. However, always follow the specific instructions given by your healthcare provider. If you are unsure, it is best to ask your healthcare provider for guidance.
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.
no u dont need to fast
The ring finger is commonly used for an INR test because it is less commonly used for tasks that may make the puncture site more prone to irritation or bleeding.
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).
PT and INR lab test.