Home
HelpTest Code Epic LAB558 Alpha-1-Antitrypsin, Random, Feces
Additional Codes
SQ code A1ATFM
Mayo code A1AF
Reporting Name
Alpha-1-Antitrypsin, Random, FSpecimen Type
FecalPerforming 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
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 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 |
Reference Values
≤54 mg/dL
Day(s) Performed
Monday through Friday
Test 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 |
Reject Due To
| Feces collected in any preservative or fixative | Reject |
Method Name
Nephelometry
Method Description
Immunonephelometry quantitates the alpha-1-antitrypsin (AAT) contained in a fecal specimen. In the absence of a timed fecal collection, an AAT fecal concentration will be reported.(Instruction manual: Siemens Nephelometer II Operations. Siemens, Inc; Version 2.3, 2008; Addendum to the Instruction Manual 2.3, 08/2017)