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Test Code LAB0232892 Alpha-1-Antitrypsin, Random, Feces

Additional Codes

Mayo Test ID
A1AF

Performing 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

Reporting Name

Alpha-1-Antitrypsin, Random, F

Specimen Type

Fecal


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

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 days

Specimen Retention Time

14 days; supernatant aliquot only, the feces are discarded after processing

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