A 20 - year - old collegiate varsity hockey player is referred to you by his coach. The young athlete has excessive bruising after a very physical match 2 days before. His knee had been bothering him, so he took two 3 2 5 mg aspirin tablets several hours before the contest. He got checked hard into the boards many times during the game, but denies any excessive or unusual trauma. As you ponder the situation you order several blood tests. Which test or finding do you most likely expect to be abnormal as a result of the prior aspirin use?
a. Activated partial thromboplastin time ( APTT )
b. Bleeding time
c. INR ( International Normalized Ratio )
d. Platelet count
e. Prothrombin time