Protein C

This test measures the level of protein C in your blood. Protein C helps your blood clot normally. If you have too little protein C (protein C deficiency), it means that your blood may clot too much. Protein C helps control blood clotting. A lack of this protein or a problem with the function of this protein may cause blood clots to form in veins. The test is also used to screen relatives of people who are known to have protein C deficiency. It may also be done to find the reason for repeated miscarriages.