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Antithrombin Antigen Level

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Updated Test Information:

Test Description
Antithrombin Antigen Level
Synonym(s)

Anti thrombin, AT, AT3, Heparin Cofactor, UOW4749
Test ID
ATAG
General Information

Patients on heparin therapy may see decreased antithrombin concentrations.
If there is a concern for heparin resistance, order Antithrombin Antigen (ATAG) instead of Antithrombin Activity (AT3). If evaluating Antithrombin for hypercoagulability, recommend ordering Antithrombin Activity assay [code: AT3].
Container Type

One full 3 or 5 mL Blue Top (Citrate) tube
Specimen Type

Blood
Specimen Requirements

Whole Tube
Specimen Collection / Processing Instructions

Centrifuge for 10 minutes, remove plasma & re-spin plasma for another 10 minutes. Decant and freeze minimum of 0.5mL plasma. Transport on dry ice.
Minimum Sample Volume

0.5 mL plasma
Stability

Frozen. Transport on dry ice.
Department (code)

Coagulation (COAG)
Methodology

Immunoturbidimetric
Estimated TAT

1 day
Testing Schedule

Daily
CPT Code(s)

85301
Reference Range

80-120


Units: %


Effective date: 05/02/2016
Performing Lab

UW
LOINC Code(s)