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https://www.msdmanuals.cn/iframe/manual/labtests/prothrombintimetestandinrptinr.html
Prothrombin Time Test and INR (PT INR)
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https://medlineplus.gov/lab-tests/prothrombin-time-test-and-inr-ptinr/
A prothrombin time test with an INR (PT/INR) measures how long it takes blood to clot. It's used to diagnose and manage bleeding and clotting disorders.
prothrombin time testinrptmedlineplusmedical