activated clotting factor的用法和样例：
- The dose of UFH was changed according to the activated clotting time level.
- Vitamin K : this vitamin is essential for hepatic synthesis of clotting factor prothrombin.
- Clotting protein abnormalities in the plasma may develop in patients with poor clotting factor production due to liver disease or increased use due to infection.
- A combination of activated clotting time measurements and the ROTEM assay might reduce the frequency of additional protamine administration, which in this study provided no measurable benefit.