Know More About This Test

Protein C is a natural anticoagulant protein produced by the liver that helps regulate blood clot formation. A Protein C test measures its level or activity in blood to evaluate the body’s ability to prevent excessive clotting.

Deficiency of Protein C increases the risk of abnormal blood clots, particularly deep vein thrombosis and pulmonary embolism.

Why Is This Test Recommended?

Protein C testing is recommended in individuals with unexplained blood clots, recurrent miscarriages, family history of thrombophilia, or prior abnormal coagulation results. It is also part of thrombophilia screening.

What Do the Results Indicate?

• Low Protein C levels suggest inherited or acquired deficiency, increasing clot risk.

• Normal levels indicate balanced anticoagulation function.

How Is the Test Performed and Prepared For?

A blood sample is drawn. Testing should not be done during acute clotting events or while on anticoagulants unless advised.

Frequently Asked Questions (FAQs)

• Is this a genetic condition? Often, yes—Protein C deficiency is frequently an inherited genetic condition passed in an autosomal dominant pattern, meaning carriers have a 50% chance of passing it to their children, and family screening is typically advised to identify at-risk relatives.

• Can liver disease affect levels? Yes, liver disease can significantly affect Protein C levels by impairing its production in the liver, leading to falsely low results that mimic hereditary deficiency, so additional liver function tests are often needed for accurate diagnosis.

• Is lifelong treatment needed? It depends on the individual's risk profile and clotting history—mild deficiencies may only require short-term anticoagulants during high-risk situations like surgery, while severe cases often necessitate lifelong preventive therapy to avoid recurrent thrombosis.

• Can pregnancy affect results? Yes, pregnancy can lower Protein C levels due to physiological changes that promote clotting for delivery, increasing thrombosis risk and requiring careful monitoring or adjusted testing timing for pregnant individuals.

• Is it part of DVT evaluation? Yes, Protein C testing is a standard component of deep vein thrombosis (DVT) evaluation, especially for unprovoked or recurrent cases in younger patients, to uncover underlying thrombophilias that guide long-term management.