Protein C
Protein C is a natural anticoagulant your body makes to help control clotting and prevent clots from growing too large. A blood test measures its level or activity.
Protein C is part of the system that keeps clotting in balance, so measuring it helps explain some tendencies to form clots. It is often checked when evaluating unexplained or recurrent clots, sometimes with a family history. It is interpreted alongside related clotting tests.
A high protein C level is generally not considered clinically significant and rarely requires action. It is not typically linked to a specific problem. Your clinician will interpret it based on why the test was ordered.
A low protein C level can be associated with an increased tendency to form clots and may be inherited or acquired. Your clinician will use further testing to interpret a low result.
A value within the normal range supports balanced control of clotting. Your clinician will interpret your result in light of your clotting and family history.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.