Antithrombin III

Antithrombin III is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
Heparin cofactor assay, 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 immunoturbidimetric.

AT-III Activity
AgeConventional Units (% of Normal)
Newborn39–87
Child82–139
Adult–older adult80–120
AgeAT-III antigen
Newborn40–60
6 mo–adult82–136

Critical Findings and Potential Interventions
N/A

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