Quick Facts
- Sample: Blood
- Fasting: No special preparation is required.
- Turnaround: 3-5 business days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures IgE antibody levels specific to alpha-galactose (alpha-gal), a sugar molecule found in mammals such as beef, pork, and lamb, as well as in products made from mammals, including gelatin, cow's milk, and milk products. The single biomarker measured is O215-IgE Alpha-Gal, reflecting IgE sensitization to this specific molecule rather than a broader panel of foods or allergens.
An elevated IgE level to alpha-gal may indicate sensitization associated with Alpha-Gal Syndrome (AGS), a condition often linked to bites from the Lone Star tick. This test measures IgE sensitization only. It does not diagnose a clinical food allergy on its own, determine the severity of a potential reaction, or establish whether a food or product is safe to consume. Results are intended to be reviewed alongside your symptoms, exposure history, and a healthcare provider's clinical judgment.
Benefits
- Measures IgE antibody levels specific to alpha-gal sensitization.
- Uses a standard blood sample with no special preparation required.
- Offers a straightforward way to check for alpha-gal IgE sensitization.
- Results are available in 3-5 business days in most cases.
- Provides objective lab data to discuss with your healthcare provider.
Who Is This Test For?
- People who have experienced symptoms after eating red meat or red meat-based products.
- Individuals with symptoms such as hives, swelling, or gastrointestinal upset several hours after eating mammalian meat.
- People who have experienced a delayed allergic reaction, typically three to eight hours after eating.
- Individuals who have had an unexplained allergic reaction to a medication containing alpha-gal, such as cetuximab.
- People who have been bitten by a tick and later developed symptoms after consuming mammalian products.
- Individuals working with a healthcare provider to evaluate a possible red meat allergy.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What does this test measure, and how is it different from other food allergy tests?
This test measures IgE antibody levels specific to alpha-gal, the sugar molecule found in mammals like beef, pork, and lamb, rather than protein-based food allergens like those found in peanuts, shellfish, or eggs. Because alpha-gal is a carbohydrate rather than a protein, and reactions are often delayed by several hours after ingestion, this test targets a distinct biomarker (O215-IgE Alpha-Gal) rather than a broader panel of foods.
2. Who should consider this test, and when?
Individuals who have experienced symptoms such as hives, swelling, abdominal pain, or difficulty breathing within three to eight hours of eating red meat or red meat-based products may want to consider this test. It may also be relevant for those who have had an unexplained reaction to a medication containing alpha-gal, such as cetuximab, or who developed symptoms after a tick bite followed by consumption of mammalian products.
3. Do I need to fast or prepare for this test?
No special preparation is required for this test. You can proceed with your normal diet and routine prior to your blood draw unless your healthcare provider advises otherwise.
4. How quickly will I get results?
Results are typically available in 3-5 business days. This timeframe may take longer based on weather, holidays, or other lab delays.
5. How should I interpret my results, and what if they are abnormal?
An elevated IgE level to alpha-gal reflects sensitization to this specific molecule, not a confirmed clinical food allergy on its own. A negative result does not guarantee that mammalian products can be consumed without any reaction, and a positive result does not by itself determine the severity of a reaction or mean that all mammalian products must be avoided. Your exact result should be reviewed together with your symptoms and history.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
If your results fall outside the expected range, a qualified healthcare provider can help you understand what they may mean in the context of your symptoms and history, and determine whether any further evaluation is appropriate. This test does not diagnose a food allergy, recommend a treatment plan, or indicate that specific foods must be eliminated from your diet on its own.
Pre-test preparation
No special preparation is required.
Cross-Reactivity
Cross-reactivity may occur when the immune system recognizes similar molecular structures across different substances, causing IgE antibodies formed against one substance to also react with another. This test measures only IgE antibodies to alpha-gal as identified above. It does not test for the additional substances discussed below. The examples that follow are not exhaustive, and they are presented as possible additional considerations rather than confirmed reactions. Having IgE sensitization to alpha-gal does not mean a person will necessarily react to every item listed. Depending on your history, symptoms, or prior reactions, discussing related evaluation with your healthcare provider may be worthwhile.
Cetuximab and similar biologic medications: This cancer therapy contains alpha-gal, and individuals with alpha-gal IgE sensitization have been reported to experience hypersensitivity reactions to it, particularly with parenteral (injected or infused) exposure.
Gelatin-containing products: Gelatin derived from mammalian sources contains alpha-gal and has been associated with reactions in some individuals with alpha-gal sensitization, including gelatin found in certain medications, vaccines, and medical products.
Other mammalian-derived medical products: Some heparin products, plasma volume expanders, and other materials manufactured from mammalian tissue have been associated with reactions in sensitized individuals and may warrant discussion with a healthcare provider before use.
Carrageenan: Although derived from red algae rather than mammals, carrageenan has been found to contain an alpha-gal-like structure, and a subset of individuals with alpha-gal sensitization have reported reactions to it in foods and other products.
