Individual test · Labcorp 164517

Protein S Antigen

This test measures the amount of Protein S in your blood, a substance that helps prevent dangerous blood clots from forming. It is useful for determining if a shortage of this protein is causing unexplained clots or contributing to a family history of clotting disorders. While this test helps identify a specific deficiency, it cannot diagnose other causes of blood clots or determine the exact reason for the low levels without further evaluation.