antithrombin III deficiency

A thrombophilia that is characterized by the tendency to form clots in the veins.

Signs and symptoms

• Decreased level of heparin co-factor II
• Recurrent thrombophlebitis
• Arterial occlusion
• Reduced antithrombin III activity
• Deep venous thrombosis
• Cerebral venous thrombosis
• Pulmonary embolism

Medications that may treat it

antithrombin III estrogens, conjugated (USP) estrone

Also known as: AT III deficiency; hereditary thrombophilia due to congenital antithrombin deficiency