Antithrombin

General

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 and AT antigen.

AT Activity
AgeConventional Units (% of Normal)
Newborn35–40
3 mo–Adult80–130
AT-III antigen
Age Conventional Units (% of Normal)
Newborn35–40
6 mo–Adult80–120

Critical Findings and Potential Interventions
N/A

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