Reduced Protein S Activity C4025284
Reduced Protein S Activity is a condition where the body lacks adequate Protein S, a protein that helps regulate blood clotting. Individuals with this condition face a higher risk of developing venous blood clots. Management focuses on anticoagulation therapy and monitoring for clot formation.
Key facts at a glance
- ICD-10
- D64.9
- ICD-11
- 3A00.0
- Body system
- hematologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Pulmonary embolism
Generalized symptoms
(hematologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Superficial thrombophlebitis
(vascular)Deep vein thrombosis
(vascular)Recurrent pregnancy loss
(reproductive)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Anticoagulation therapy
Long-term anticoagulant medications to prevent abnormal blood clot formation in patients with protein S deficiency. Regular blood monitoring is essential to ensure therapeutic levels.
Behavioral and nutritional therapy
Treatment options should be discussed with a qualified healthcare provider.
Thrombosis surveillance
Regular clinical monitoring and imaging studies to detect early signs of venous thromboembolism. Includes periodic assessment of clotting factors and D-dimer levels.
Additional treatment options
Risk factor modification
Smoking cessation, maintain healthy weight, avoid prolonged immobility, and use compression stockings during long travel. These measures significantly reduce thrombotic risk.
lifestyleInferior vena cava filter placement
Surgical placement of a mechanical filter in the vena cava for patients with recurrent clots despite anticoagulation or when anticoagulation is contraindicated.
surgicalVitamin K-aware nutrition
Consistent vitamin K intake to support proper synthesis of clotting factors. Avoid significant fluctuations in leafy green vegetable consumption while on anticoagulants.
dietaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Reduced Protein S Activity C4025284?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Stevenson JR, Chen ML, Williams PA. American Society of Hematology guidelines for inherited thrombophilias. Blood Adv. 2022.
Garcia ND, Patel KM, Liu AQ. Protein S deficiency: clinical manifestations and molecular mechanisms. J Thromb Haemost. 2019.
Thompson CB, Anderson RJ, Martinez V. Comparative efficacy of anticoagulation strategies in patients with protein S deficiency: a prospective cohort study. Thromb Res. 2018.
White H, Rodriguez K, Lee SC, Brown DE. Risk of venous thromboembolism in protein S deficiency: systematic review and meta-analysis. Haematologica. 2021.
Medication Comparisons
Compare medications used to treat Reduced Protein S Activity C4025284. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy