Antithrombin III Antigen

Overview

  • EPIC Code:
  • IMO404
  • Soft Test Code:
  • A3AG
  • Send Out Test Code:
  • 68823
Alternate Names
  • Antithrombin III Ag
  • Antithrombin III Antigenic
Clinical Significance

Previously referred to as antithrombin III, antithrombin antigen is an inhibitor of several coagulation factors. Patients with low concentrations of Antithrombin Antigen may have an hereditary or acquired prothrombotic state. The Antigenic test differentiates a Type I from Type II deficiency.


Specimen Collection & Preparation

Specimen Requirements

2.0 mL Platelet Poor Plasma from a Blue Top Tube - 3.2% Na Citrate in a Plastic Vial

Alternate Specimen

 

TransportAndStorage

21 days Frozen

Collection Instructions

Draw blood in light blue-top tube containing 3.2% sodium citrate, and mix gently by inverting 3-4 times. 
Centrifuge 15 minutes at 1500 x g within 1 hour of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet
buffy layer and place into a plastic vial. 
Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial(s). 
Freeze immediately and transport on dry ice

Clinical Interpretation

Reference Range:

80-120%


Methodology:
  • Immunoturbidimetric

Clinical Significance

Previously referred to as antithrombin III, antithrombin antigen is an inhibitor of several coagulation factors. Patients with low concentrations of Antithrombin Antigen may have an hereditary or acquired prothrombotic state. The Antigenic test differentiates a Type I from Type II deficiency.


Production Schedule

Sites Performed
  • Quest - Chantilly
Days Performed
Monday
Tuesday
Wednesday
Thursday
Friday
Departments
  • Sendouts - Clinical
Turn Around Time

3 to 6 days


Coding & Compliance

CDM

00910600


CPT Coding

85301