Description
Why It’s Done:
This test is ordered to:
• Diagnose functional antithrombin III deficiency, which can be hereditary or acquired
• Evaluate unexplained or recurrent venous thromboembolism (deep vein thrombosis, pulmonary embolism)
• Monitor anticoagulant therapy effectiveness, especially heparin, which depends on antithrombin activity
• Investigate causes of recurrent miscarriages or clotting disorders linked to antithrombin dysfunction
Preparation:
• No special preparation is typically required.
• Inform your healthcare provider about any anticoagulant or blood-thinning medications, as they may affect test results.
• Blood is drawn from a vein, usually in the arm.
• Fasting is not necessary.
