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
The Oyster Allergy IgE Blood Test measures F290-IgE Oyster, the level of oyster-specific IgE antibodies in your blood. IgE is the type of antibody your immune system produces when it identifies a substance as harmful, which can lead to the release of histamine and allergy symptoms.
This is a single-allergen test for oysters only. Oysters are mollusks in the Bivalve family. The test does not measure other shellfish or seafood. A result reflects IgE to oysters and does not, on its own, confirm a clinical food allergy.
Benefits
- Measures IgE antibody levels specific to oysters.
- Focuses on one allergen, so results stay clear and easy to review.
- Uses a simple blood sample with no special preparation.
- Gives you oyster-specific information to discuss with your healthcare provider.
- Delivers results online in 3-5 business days.
Who Is This Test For?
- You have had symptoms you suspect are related to a seafood allergy.
- You have noticed tingling around the mouth, swelling, itching, or hives after eating.
- You have had abdominal discomfort, nausea, vomiting, or diarrhea that may be seafood-related.
- You have experienced congestion, wheezing, or lightheadedness and want to explore oysters as a possible trigger.
- You want oyster-specific IgE results to share with your healthcare provider.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What exactly does this test look at, and what does it leave out?
Oyster-specific IgE antibodies in your blood are the focus of this test, reported as F290-IgE Oyster. Oysters are mollusks, and the test measures oysters only. Clams, scallops, mussels, and other seafood are not included. Your healthcare provider can use the result alongside your history and symptoms.
2. Who should consider this test, and when?
If you have had symptoms you suspect may be linked to seafood, this test may be worth considering. Reactions can involve the skin, digestive tract, or airways, and most occur within two hours of eating, often within minutes. Some are delayed by four to six hours or longer. Severe symptoms such as a swollen throat, difficulty breathing, or loss of consciousness may indicate anaphylaxis and require immediate medical attention.
3. Do I need to fast or prepare for this test?
No special preparation is required.
4. How long will my results take?
Results are expected in 3-5 business days. May take longer based on weather, holiday or lab delays.
5. How should I interpret my results, and what if they are abnormal?
A result shows the level of oyster-specific IgE in your blood. It cannot alone confirm a clinical food allergy, rule one out, or show how severe a future reaction might be. The meaning depends on your symptoms, history, and other information. If your result is outside the reference range, review it with a qualified healthcare provider, who can advise on next steps.
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.
Pre-test preparation
No special preparation is required.
Cross-Reactivity
Cross-reactivity may occur when the immune system recognizes similar proteins in different foods or substances. This test measures only oyster-specific IgE and does not test for any of the items listed below. These examples are not exhaustive, and they are possible considerations, not confirmed allergies. Being cross-reactive does not mean you will react to another item. Depending on your history, symptoms, or your healthcare provider's guidance, testing for related allergens may also be worth discussing.
- Other mollusks (clams, mussels, scallops): These share allergenic proteins such as tropomyosin with oysters, and some people react to more than one mollusk.
- Other mollusks (squid, octopus, snails, abalone): Cross-reactivity has been reported between different mollusk groups, though how it shows up varies from person to person.
- Crustaceans (shrimp, crab, lobster): Tropomyosin is also found in crustaceans, and cross-reactivity with mollusks has been reported in some people.
- Dust mites and cockroaches: These contain tropomyosin-like proteins that have been associated with cross-reactivity to shellfish in some people.
