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 | |
|---|---|
| Age | Conventional Units (% of Normal) |
| Newborn | 35–40 |
| 3 mo–Adult | 80–130 |
| AT-III antigen | |
| Age | Conventional Units (% of Normal) |
| Newborn | 35–40 |
| 6 mo–Adult | 80–120 |
Critical Findings and Potential Interventions
N/A
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