Alpha-1 Antitrypsin Antigen, Tissue — Qualitative (Stain Method)
A qualitative tissue test that detects alpha-1 antitrypsin antigen in a biopsy sample, often used with other findings when evaluating alpha-1 antitrypsin deficiency.
["This test checks whether alpha-1 antitrypsin can be detected in sampled tissue."]
Key facts at a glance
- LOINC
- 10462-0
- Short code
- A1AT Ag Tiss Ql ImStn
- Synonyms
- A1AT Ag Tiss Ql ImStn
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- immune-stain
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
This test examines a tissue specimen for alpha-1 antitrypsin, a protein made by the liver. It is a qualitative test, so the result reports whether the protein is detected rather than providing a precise concentration.
Why might I need this test?
Alpha-1 antitrypsin deficiency is an inherited condition that can increase the risk of lung disease and certain forms of liver disease. Tissue testing may be used when a liver biopsy is being reviewed or when blood and genetic test results need additional context.
How is the test performed?
A laboratory examines the tissue sample using a stain-based method and reports whether alpha-1 antitrypsin antigen is present. Because this is a tissue test, results are usually interpreted by a pathologist together with the biopsy findings and other laboratory results.
How do I prepare for the test?
No special preparation is usually needed when an existing tissue specimen is used. If a biopsy is required, your clinician will explain the procedure and any preparation instructions specific to that procedure.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Detecting alpha-1 antitrypsin in tissue indicates that the antigen is present in the sampled area. Reduced or absent staining may support alpha-1 antitrypsin deficiency, but interpretation can be affected by the type and handling of the tissue, so the result must be considered with blood tests, genetic testing, and pathology findings.
Short name
Alpha-1 antitrypsin tissue antigen
Frequently asked questions
Is this the same as a blood test for alpha-1 antitrypsin?
Does this test diagnose alpha-1 antitrypsin deficiency by itself?
What if alpha-1 antitrypsin is not detected in the tissue?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy