Synonym/Acronym:
Antithrombin III, Antithrombin-heparin cofactor, AT, AT-III.
Rationale
To assist in diagnosing heparin resistance or disorders resulting from a hypercoagulable state such as thrombus.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
Method: Chromogenic for AT activity; Microlatex particle-mediated immunoassay for AT antigen.
AT Activity | |
---|---|
Age | Conventional Units (% of Normal) |
Newborn | 39–87 |
Child | 82–139 |
Adult–older adult | 80–120 |
AT-III antigen | |
Age | Conventional Units (% of Normal) |
Newborn | 40–60 |
6 mo–adult | 82–136 |
Critical Findings and Potential Interventions
N/A
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