MedlinePlus - Prothrombin time Prothrombin time (PT) Prothrombin time (PT) MedlinePlus - Prothrombin time prothrombin time prothrombin time Prothrombin time (PT) https://medlineplus.gov/ency/article/003652.htm Prothrombin time (PT) Prothrombin time (PT) Prothrombin time (PT) prothrombin time Prothrombin time (PT)