Antithrombin III Antigen
Fasting Required: Yes 10-12 hours

Specimen: Blood

Lab: Quest Diagnostics

Results: 7-10 business days
Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

Patient Preparation: Patient should abstain from anabolic steroids, Gemfibrozil, Warfarin (Coumadin®), heparin therapy, asparaginase, estrogens, gestodene and oral contraceptives optimally for 3 days prior to specimen collection.

Description: Antithrombin antigen is an inhibitor of several coagulation factors. Patients with low concentrations of Antithrombin Antigen may have a hereditary or acquired prothrombotic state. The Antigenic test differentiates a Type I from Type II deficiency.