Antithrombin antigen

Alphabetical Test listing

Antithrombin antigen-994

Test name:

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

Antithrombin III activity
Antithrombin III, functional
AT
AT3 activity
Factor Xa inhibitor
Heparin Cofactor Activity
Serine Protease Inhibitor

Useful for:

Confirmation and characterization of congenital AT deficiency

Specimen type:

Sodium citrate (Na cit) plasma

Collection container:

Two (2) Lt blue Sodium citrate (NaCit) - 2.7mL

Volume:

2.0 mL

Minimum volume:

1.0 mL

Collection instructions:

Do not draw from an arm with a heparin lock or heparinized catheter

Processing instructions:

Spin
Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)
Freeze

Transport container:

Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)

Transport and stability:

Frozen - 28 days

Freeze/thaw cycles - stable x3

Reason for rejection:

Severe hemolysis
Improper labeling
Clotted specimen
Specimen diluted with IV fluids
Samples thawed in transit
Improper sample type
Sample out of stability

Performing lab:

LabCorp Burlington (015057): R-NX

Days set up:

Mo - Fr

TAT:

2 - 3 days

Method:

Automated (LIATEST) enzyme immunoassay (EIA)

Reference ranges:

72 - 124%

In newborns, AT levels are lower than in adults (39% to 89%)
Levels gradually reach adult ranges by six months of age

CPT codes:

85301

LOINC code:

Result 27812-7

Date created:

06/25/2019

Revised date:

05/31/2024

Review date:

02/20/2024