Protein S

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Normal values are 60-150% inhibition.

Deficient protein S can result in excessive clotting tendencies. These are usually vein clots, such as deep vein thrombosis (DVT), but occasionally this disorder can be associated with arterial clots.

A protein S deficiency may be inherited. It can also be acquired due to pregnancy or certain diseases, including disseminated intravascular coagulation and HIV infection.

Review Date: 04/15/2005
Reviewed By: Rita Nanda, MD, Department of Medicine, Section of Hematology/Oncology, University of Chicago Medical Center, Chicago, IL. Review provided by VeriMed Healthcare Network.