Management of Protein C Deficiency and Venous Thromboembolism

Diagnostic Approach

• If DVT is ruled out but clinical suspicion remains high, consider CT pulmonary angiography to exclude pulmonary embolism, as recommended by the Genetics in Medicine guidelines 1

Anticoagulation Management

• The American Society of Hematology guidelines suggest against routine prophylactic anticoagulation in asymptomatic individuals with protein C deficiency without prior VTE, but emphasize the importance of individualized risk assessment 2, 3, 4

Special Considerations

• Avoid estrogen-containing contraceptives and hormone replacement therapy, which synergistically increase thrombotic risk, as advised by the Genetics in Medicine guidelines 1
• Postpartum prophylaxis with LMWH for 6 weeks is strongly recommended for patients with protein C deficiency and positive family history of VTE, due to the high postpartum thrombotic risk 2, 3, 4, 5

Monitoring and Prevention

• For patients on warfarin, INR monitoring 2-3 times weekly until stable therapeutic range (2.0-3.0) is recommended, then weekly, eventually every 4 weeks once stable, as suggested by the Praxis Medical Insights guidelines 5
• Annual renal function assessment, medication adherence checks, and bleeding risk reassessment are necessary for patients on DOACs, according to the Praxis Medical Insights guidelines 7