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Protein S Deficiency is a rare blood clotting disorder in which the body has insufficient levels of protein S, a natural anticoagulant that helps regulate blood clot formation. Protein S works together with protein C to prevent excessive clotting by inactivating certain clotting factors. When protein S levels are low or its function is impaired, the risk of developing abnormal blood clots significantly increases.

The condition may be inherited due to genetic mutations or acquired as a result of liver disease, pregnancy, vitamin K deficiency, certain medications, or autoimmune disorders. Some individuals remain symptom-free throughout life, while others experience deep vein thrombosis (DVT), pulmonary embolism (PE), or recurrent blood clots at a young age. In rare cases, severe deficiency can cause life-threatening clotting complications.

Diagnosis involves blood tests that measure free protein S antigen, total protein S antigen, and functional protein S activity. Testing may need to be repeated because levels can fluctuate due to illness or medication use.

Treatment depends on the patient's medical history and clotting risk. Anticoagulant medications are commonly prescribed after a clotting event or during high-risk situations such as surgery or pregnancy. Lifestyle modifications, early recognition of symptoms, and regular medical follow-up help reduce complications and improve long-term outcomes for individuals with Protein S Deficiency.