Antithrombin
Also known as: Functional Antithrombin III; AT III
Formal name: Antithrombin (Activity and Antigen)
Related tests: PTT; Coagulation factors; D-dimer; Fibrinogen; Homocysteine; Lupus Anticoagulant; Proteins C & S; PT; PT 20210; Factor V Leiden
At a Glance
Why Get Tested?
To help investigate the cause of recurrent inappropriate blood clotting; to help diagnose an antithrombin deficiency
When to Get Tested?
A couple of months after a thrombotic episode or if you are not responding as your doctor expected to heparin anticoagulation therapy
Sample Required?
A blood sample drawn from a vein in your arm
Test Preparation Needed?
None
