prothrombin time(redirected from International normalized ratio)
Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms.
Related to International normalized ratio: INR
prothrombin time[prō′thräm·bən ‚tīm]
A one-stage clotting test based on the time required for clotting to occur after the addition of tissue thromboplastin and calcium to decalcified plasma.