Test Catalog

Test ID: A1AFS    
Alpha-1-Antitrypsin Clearance, Feces and Serum

Specimen Type Describes the specimen type validated for testing


Ordering Guidance

The recommended procedure for protein-losing enteropathy is A1AFS / Alpha-1-Antitrypsin Clearance, Feces and Serum.

Shipping Instructions

Feces and serum should be shipped together. Specimens shipped separately may delay testing.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Both feces and serum are required.


Blood must be drawn during the stool collection period.


Specimen Type: Serum

Collection Container/Tube: Red top or serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Centrifuge within 2 hours.

2. Aliquot and ship in plastic vial.


Specimen Type: Feces

Supplies: Stool Containers - 24, 48, 72 Hour Kit (T291)

Container/Tube: Stool container

Specimen Volume: Entire collection

Collection Instructions:

1. Collect a 24-hour fecal collection.

2. If no specimen is obtained within 24 hours, extend collection time to 48 to 72 hours. Document time frame.


If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Client Test Request (T728) with the specimen.

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

Homogenized feces: 1 mL
Serum: 0.5 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK
Feces collected in any preservative or fixative Reject

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTimeSpecial Container
FecalFrozen (preferred)14 days
 Ambient 14 days
 Refrigerated 14 days
SerumFrozen (preferred)28 days
 Ambient 28 days
 Refrigerated 28 days