Definition of thromboplastin in US English:



  • An enzyme released from damaged cells, especially platelets, which converts prothrombin to thrombin during the early stages of blood coagulation.

    • ‘A study in laboratory rats showed that ginsenosides increased coagulation time of thrombin and activated partial thromboplastin (aPTT).’
    • ‘The tests that are performed are a complete blood count, blood chemistry, prothrombin time, partial thromboplastin time, electrocardiogram, and chest x-rays.’
    • ‘The atrial fibrillation group also had more hematologic tests done, including more prothrombin and partial thromboplastin times.’
    • ‘Indicated tests include a complete blood cell count with platelet count, a peripheral blood smear, and prothrombin and activated partial thromboplastin times.’
    • ‘In the second stage, prothrombin is activated by thromboplastin to make thrombin.’