Test library
Oyster Shellfish Allergy Blood Test
An Oyster allergy blood test measures IgE antibodies against oyster proteins. It helps assess shellfish sensitization when reactions occur after eating oysters or related mollusks.
Order Oyster Allergy Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Oyster Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The Oyster allergy test uses a blood sample to measure immunoglobulin E antibodies against proteins found in oysters. Oysters are mollusks, a group of shellfish that also includes clams, mussels, and scallops. Reactions can range from mild oral itching to more serious symptoms, so testing helps clarify whether sensitization is present alongside a clinical history.
What this test measures
Shellfish allergy covers two main groups: crustaceans such as shrimp and crab, and mollusks such as oysters, clams, and mussels. Oyster allergy belongs to the mollusk group, though reactions and cross-reactivity patterns vary between the two. Some people react to one type of shellfish and tolerate the other, while others react to several.
The test measures allergen-specific IgE in serum using a laboratory immunoassay. A single blood draw is enough, and the laboratory reports the oyster-specific IgE level together with a reactivity class. Because shellfish allergens include a protein called tropomyosin and other components, results are often reviewed with tests for related shellfish.
A positive result shows that the immune system has made antibodies against oyster proteins. It does not confirm that eating oysters will cause a reaction, and it does not predict severity. A qualified healthcare provider interprets the result with the person's symptoms, other food allergy tests, and the circumstances of any reaction.
- Oyster-specific IgE antibodies
- Total serum IgE
- Quantitative allergen-specific IgE level
- IgE reactivity class for oyster
- Tropomyosin, a common shellfish allergen
- Related mollusk and crustacean allergens when included
Why people order this test
- Evaluate a reaction that occurred after eating oysters
- Assess shellfish sensitization as part of a food allergy workup
- Help distinguish mollusk from crustacean sensitivity
- Provide context before discussing dietary choices with a provider
- Follow up on oral itching, skin, or respiratory symptoms after shellfish
- Compare reactivity across related shellfish allergens
How to prepare
No fasting is required for this test. A blood sample is collected from a vein, usually at the arm. Follow any instructions provided by the laboratory if the test is part of a larger allergy panel.
Understanding your results
Results are generally reported within one to three business days. The report shows the oyster-specific IgE level and a reactivity class. An elevated value indicates sensitization, and a qualified healthcare provider can explain what it means for the individual.
Oyster Shellfish Allergy Blood Test by state
Alabama
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Arkansas
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California
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Colorado
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Connecticut
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Delaware
Oyster Shellfish Allergy Blood Test across Delaware.
Florida
Oyster Shellfish Allergy Blood Test across Florida.
Georgia
Oyster Shellfish Allergy Blood Test across Georgia.
Hawaii
Oyster Shellfish Allergy Blood Test across Hawaii.
Idaho
Oyster Shellfish Allergy Blood Test across Idaho.
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Frequently Asked Questions
Are oysters shellfish?
Yes. Oysters are mollusks, one of the two main shellfish groups. The other group is crustaceans, which includes shrimp, crab, and lobster.
If I react to oysters, will I react to shrimp?
Not necessarily. Mollusk and crustacean allergies are related but distinct. Some people react to both groups, while others tolerate one. Testing and clinical history help clarify this.
How is the test performed?
A small blood sample is drawn from a vein and analyzed for IgE antibodies that react to oyster proteins.
Does a positive result mean I have a shellfish allergy?
A positive result indicates sensitization. Whether symptoms occur depends on the person and the exposure, which a healthcare provider evaluates.
Do I need to fast?
Fasting is not required for this test unless it is combined with another panel that needs it.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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