noun[mass noun] Biochemistry
An enzyme released from damaged cells, especially platelets, which converts prothrombin to thrombin during the early stages of blood coagulation.
- In the second stage, prothrombin is activated by thromboplastin to make thrombin.
- Indicated tests include a complete blood cell count with platelet count, a peripheral blood smear, and prothrombin and activated partial thromboplastin times.
- The atrial fibrillation group also had more hematologic tests done, including more prothrombin and partial thromboplastin times.
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