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 in your blood specific to mussels (also known as blue mussel or common mussel). IgE is the type of antibody the immune system produces in an allergic response, and this test looks only at IgE, not other antibody classes.
Mussels are mollusks, but this test measures mussels only. It does not provide results for clams, oysters, scallops, or any other seafood. Your result reflects mussel-specific IgE in your blood and should be reviewed alongside your symptoms and history by a healthcare provider.
Benefits
- Measures mussel-specific IgE antibodies in your blood.
- Helps you and your provider evaluate a possible mussel allergy.
- Requires only a blood sample with no special preparation.
- Delivers results online for easy access and sharing.
- Focuses on one allergen, so results are easy to understand.
Who Is This Test For?
- People who have had symptoms after eating or handling mussels.
- Individuals with symptoms linked to a seafood allergy, such as hives, swelling, or nausea.
- Anyone who has felt tingling around the mouth after eating seafood.
- People who want to discuss mussel-specific IgE results with a healthcare provider.
- Individuals who have had digestive or breathing symptoms after seafood exposure.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What does this test measure, and does it include other shellfish?
It measures IgE antibodies specific to mussels in your blood, which may help a healthcare provider evaluate a possible mussel allergy. It does not test other shellfish, including clams, oysters, or scallops, even though mussels are related to them. A result alone does not confirm a clinical food allergy.
2. Who should consider this test, and when?
Anyone who has experienced symptoms that may be related to a seafood allergy may consider this test. Food-related symptoms most often begin within minutes and usually within two hours of ingestion, though in rare cases they can be delayed by four to six hours or longer. Severe symptoms such as a swollen throat or difficulty breathing require immediate medical attention.
3. Do I need to fast or prepare for this test?
No special preparation is required. You can visit the lab for your blood draw without following any fasting or other preparation steps.
4. How quickly will I get my results?
Expect results in 3-5 business days. May take longer based on weather, holiday or lab delays.
5. How do I interpret my results, and what should I do if they are abnormal?
A result shows the level of mussel-specific IgE in your blood. It cannot on its own confirm a clinical allergy, predict the severity of a reaction, or determine whether mussels are safe for you to eat. Your healthcare provider can interpret it alongside your symptoms and history and advise on any next steps, including whether further evaluation is appropriate.
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 mussel-specific IgE and does not test for any of the items listed below. These examples are not exhaustive, and they represent possible relationships, not confirmed allergies. Being sensitized to mussels does not mean you will react to any of them. Depending on your history, symptoms, or provider's guidance, related allergen testing may be worth discussing.
- Other mollusks (clams, oysters, scallops): These share a muscle protein called tropomyosin with mussels, and some people allergic to one mollusk may also react to others.
- Cephalopods (squid, octopus): Cross-reactivity between bivalve mollusks and cephalopods has been reported, likely due to similar tropomyosin proteins, though it varies from person to person.
- Snails and abalone: These mollusks may share allergenic proteins with mussels, and some people with a mollusk allergy report reactions to them.
- Crustaceans (shrimp, crab, lobster):Tropomyosin is also found in crustaceans, and cross-reactivity between crustaceans and mollusks has been reported in some people.
- House dust mites and cockroaches: These contain tropomyosin similar to that in shellfish, and sensitization to them has been associated with shellfish reactivity in some people.
