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HelpTest Code A1AF Alpha-1-Antitrypsin, Random, Feces
Reporting Name
Alpha-1-Antitrypsin, Random, FPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Diagnosing protein-losing enteropathies, especially when used in conjunction with serum alpha-1-antitrypsin (AAT) levels as a part of AAT clearance studies
Method Name
Nephelometry
Ordering Guidance
The preferred test for diagnosing protein-losing enteropathies is A1AFS / Alpha-1-Antitrypsin Clearance, Feces and Serum.
Specimen Required
Supplies:
-Stool container, Small (Random), 4 oz (T288)
-Stool Collection Kit, Random (T635)
Container/Tube: Stool container
Specimen Volume: 5 g
Collection Instructions: Collect a random fecal specimen.
Specimen Type
FecalSpecimen Minimum Volume
Homogenized Stool: 1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Fecal | Frozen (preferred) | 14 days | |
| Ambient | 14 days | ||
| Refrigerated | 14 days |
Reject Due To
| Feces collected in any preservative or fixative | Reject |
Reference Values
≤54 mg/dL
Interpretation
Patients with protein-losing enteropathies generally have alpha-1-antitrypsin fecal concentrations over 100 mg/dL.
Borderline elevations above the normal range are equivocal for protein-losing enteropathies.
Day(s) Performed
Monday through Friday
Report Available
1 to 3 daysTest Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82103
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| A1AF | Alpha-1-Antitrypsin, Random, F | 9407-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| AAT_F | Alpha-1-Antitrypsin, Random, F | 9407-8 |