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Prince Alfred Singh։ Understanding Antithrombin III Deficiency as a High-Risk Thrombophilia
Prince Alfred Singh/LinkedIn
Apr 15, 2026, 14:25

Prince Alfred Singh։ Understanding Antithrombin III Deficiency as a High-Risk Thrombophilia

Prince Alfred Singh, Medical Officer at Addu Equatorial Hospital (AEH), shared a post on LinkedIn:

“Understanding Antithrombin III Deficiency: A High-Risk Thrombophilia

Antithrombin III (AT III) plays a critical role as the body’s natural anticoagulant – primarily inhibiting thrombin (IIa) and factor Xa to prevent excessive clot formation.

What happens in AT III deficiency?

A reduction in this key inhibitor shifts the hemostatic balance toward thrombosis, making it one of the most clinically significant inherited thrombophilias.

Key Facts:

  • Inherited in an autosomal dominant pattern
  • Prevalence: approximately 1 in 3,000 individuals
  • Strongly associated with recurrent venous thromboembolism (VTE)
  • Arterial events are less common but can occur

Risk Perspective:

Compared to other thrombophilias such as Factor V Leiden or Protein C deficiency, AT III deficiency carries one of the highest relative risks for VTE.

Clinical Management Insights:

  • Many patients require long-term anticoagulation (e.g., warfarin)
  • Heparin resistance can occur due to low AT levels
  • In pregnancy: heparin-based therapy is preferred
  • Consider AT concentrate in selected high-risk scenarios

Clinical Takeaway:

  • Early recognition is essential—especially in patients with:
  • Recurrent unexplained VTE
  • Strong family history of thrombosis
  • Thrombosis at a young age

A tailored, lifelong management strategy can significantly reduce morbidity and prevent life-threatening complications.”

Prince Alfred Singh։ Understanding Antithrombin III Deficiency as a High-Risk Thrombophilia

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Antithrombin III Deficiency bleeding disorders Health Hematology Hemostasis Hemostasis News Hemostasis Today High-Risk Thrombophilia Medicine Prince Alfred Singh Thrombophilia thrombosis venous thromboembolism VTE
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