Understanding Your Laboratory Test: A Patient's Guide to What It Is, Why It Is Needed, and What the Results Mean
This blood test measures IgA antibodies against baker's yeast in your blood, helping doctors check for certain autoimmune conditions.
{"A simple blood test that looks for antibodies to baker's yeast","Mainly used to help diagnose autoimmune pancreatitis and related conditions","Results are reported as positive or negative (titer levels may also be provided)","No special preparation is needed before the test","Results are interpreted along with other tests and your symptoms"}
Key facts at a glance
- LOINC
- 110741-6
- Short code
- BAKYEA
- Synonyms
- Baker's yeast IgA Msmt Ser
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST) or red-top clot tube
- Units
- N/A
- Ref low
- 20
- Ref high
- 25
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Enzyme Immunoassay (EIA) / ELISA
- CPT
- 83516
- SNOMED
- 39437008
- Specimen volume
- 1.0 mL serum (minimum 0.5 mL)
- Stability
- Room temperature: 8 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
What is this test, and what does it check for in my body?
The Baker's Yeast IgA Antibody test is a blood test that detects IgA antibodies against Saccharomyces cerevisiae, also known as baker's yeast. IgA is a type of antibody (immunoglobulin) that plays an important role in your immune system, particularly in mucous membranes lining the respiratory and digestive tracts.
Why do I need this test, and what health concerns can it help my doctor identify?
Your doctor may order this test if they suspect you have an autoimmune condition, particularly autoimmune pancreatitis (a type of pancreatic inflammation) or IgG4-related disease. This test helps your doctor distinguish between different types of pancreatic or inflammatory conditions. It may also be used to monitor these conditions over time.
How is the test done, and do I need to do anything special to prepare for it?
A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory for analysis. You don't need to fast or make any special preparations before this test. The blood draw only takes a few minutes and may cause minor bruising or soreness at the injection site.
What do the results mean, and when will my doctor discuss them with me?
Results are typically reported as positive or negative for IgA antibodies against baker's yeast. A positive result may indicate the presence of certain autoimmune conditions, particularly autoimmune pancreatitis or IgG4-related disease. However, a positive result alone does not confirm a diagnosis - your doctor will consider your symptoms, medical history, and other test results when making a diagnosis. Some people may have positive results without having any symptoms, so context is important.
Reference range
Negative: <20 U/mL; Equivocal: 20-25 U/mL; Positive: >25 U/mL. Reference values may vary by laboratory and assay manufacturer.N/A
No special patient preparation required. Fasting is not necessary.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The Baker's Yeast IgA Antibody test is primarily used in the diagnosis of autoimmune pancreatitis (AIP), a condition where the body's immune system attacks the pancreas. It is also associated with IgG4-related disease, a disorder that can affect multiple organs. This test helps differentiate autoimmune pancreatitis from other conditions like pancreatic cancer or chronic pancreatitis. The presence of these antibodies, along with other clinical findings, supports the diagnosis. The test may also be used to monitor disease activity or response to treatment in some cases.
Frequently asked questions
Is this test the same as a yeast allergy test?
Do I need to avoid bread or yeast products before this test?
Can this test diagnose pancreatic cancer?
What happens if my result is positive?
Is this a routine test?
Sources
- 1
- 2
- 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 17, 2026. · Read our editorial policy