Understanding Your Diagnostic Test: What It Is, How It Is Done, and Why Your Doctor Ordered It
A specialized laboratory test that uses immune staining techniques to detect the AE3 antigen (a type of cytokeratin protein) in tissue samples, helping doctors identify certain cell types and abnormalities.
{"AE3 is a marker that detects cytokeratin proteins in cells","The test uses immune staining on tissue samples, not blood","Helps distinguish between different cell types and tumors","Commonly used in cancer diagnosis and classification","Results help guide treatment decisions"}
Key facts at a glance
- LOINC
- 10430-7
- Short code
- AE3AgTissue
- Synonyms
- AE3 Ag Tiss Ql ImStn
- Category
- chemistry
- Sample
- serum
- Container
- Tissue container with 10% neutral buffered formalin (ratio 10:1 formalin to tissue)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- immune-stain
- CPT
- 88342
- SNOMED
- 371441009
- Specimen volume
- Adequate tissue sample (minimum 3mm x 3mm recommended)
- Stability
- Formalin-fixed tissue: stable at room temperature for 24-48 hours post-fixation; paraffin-embedded blocks: stable for years at room temperature; unstained slides: stable for several weeks at 2-8°C
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 48–96 hours
- Order
- routine
What is this test, and what can it tell your healthcare provider about your overall health and symptoms?
The AE3 antigen test is a specialized pathology test that uses a technique called immunohistochemistry (immune staining). It detects the presence of AE3, which is a type of cytokeratin protein found in epithelial cells. Cytokeratins are structural proteins that help maintain the shape and function of cells. This test helps pathologists identify and classify cells under a microscope.
How is this test performed, and what should you expect before, during, and after the procedure?
A tissue sample (usually obtained through a biopsy or during surgery) is treated with special antibodies that bind specifically to the AE3 antigen. A colored marker is then attached to these antibodies, allowing them to be visible under a microscope. If the tissue cells contain AE3, they will show up with the colored stain, indicating a positive result.
Why might your doctor order this test, and which conditions or health concerns can it help detect and monitor?
Doctors order this test to help determine the origin and type of cells in a tumor or tissue sample. AE3 is a marker for epithelial cells, so it helps distinguish epithelial tumors from other types of tumors. It is commonly used in cancer diagnosis to classify tumors and determine appropriate treatment options.
Reference range
Result reported as Presence or Absence of AE3 antigen staining. Positive staining indicates presence of the target antigen in the tissue specimen. Negative staining indicates absence of detectable AE3 antigen.N/A
No special patient preparation required. Test is performed on tissue obtained via biopsy or surgical specimen. Proper fixation (10% neutral buffered formalin) is essential for antigen preservation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The AE3 antigen test is primarily used in cancer pathology. A positive AE3 stain indicates the presence of epithelial cells, which helps classify tumors as carcinomas (cancers arising from epithelial cells). This information is crucial for accurate diagnosis, determining cancer stage, and selecting appropriate treatment strategies. It can also help distinguish between primary tumors and metastatic tumors.
Frequently asked questions
Is this test done on blood?
How long does it take to get results?
Does a positive result mean I have cancer?
Are there any risks from this test?
Sources
- 1
- 2
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