Antithrombin III Antigen

Last Modified: 2/13/2019 11:05:31 AM

Medical Necessity Documentation:  
Client Notes:  
Patient Preparation:  
Specimen Requirements: 2.0 mL Platelet Poor Plasma from a Blue Top Tube - 3.2% Na Citrate in a Plastic Vial
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
Minimum Volume: 0.5 mL Platelet Poor Plasma
Transport & Storage: Temperature/Stability: 21 days Frozen
Reference Range: 80-120%
Critical Ranges:  
Test Comments:  
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.
Custom Panel: No


Turn Around Time: 3 to 6 days
Days Performed: Monday, Tuesday, Wednesday, Thursday, Friday
Sites Performed: Quest - Chantilly
PHL Test Code: A3AG
EPIC Test Code: IMO404
Send Out Test Code: 68823
Alternate Test Names: Antithrombin III Ag; Antithrombin III Antigenic
Included Tests:  
CPT Coding: 85301

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