Test library
Clam Allergy Blood Test
This shellfish allergy blood test measures IgE antibodies against clam proteins, helping evaluate reactions such as hives, oral itching, or digestive symptoms after eating clams or related shellfish.
Order Clam 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 Clam Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The clam allergy test is a blood test that measures immunoglobulin E antibodies to proteins found in clams. It is intended for people who have reacted to clams or other shellfish and want objective information about sensitization. A healthcare provider interprets the result with your reaction history and may recommend additional shellfish testing.
What this test measures
This test measures allergen-specific immunoglobulin E against clam proteins in a serum sample. Shellfish allergy is one of the more common food allergies in adults and can persist for life. Clams belong to the mollusk group, which is distinct from crustaceans such as shrimp and crab, although some proteins overlap between the two groups. The assay reports clam-specific antibody levels and an IgE class.
The sample is obtained through a routine blood draw at a partner laboratory and analyzed by immunoassay. Results are expressed in kilounits per liter, with total IgE and eosinophil counts sometimes included as supporting information. Tropomyosin, a muscle protein shared by many shellfish, is a frequent target of allergic antibodies, so cross-reactive patterns may be evaluated when a broader shellfish panel is ordered.
People order this test after experiencing hives, swelling, oral itching, breathing changes, or gastrointestinal symptoms following clam consumption. It may also be requested before broadening a diet that includes mollusks. The test detects sensitization and does not measure reaction severity, so a qualified healthcare provider should guide interpretation and any decisions about dietary exposure.
- Clam-specific IgE antibodies
- Quantitative sIgE concentration reported in kU/L
- Allergen-specific IgE class on the zero to six scale
- Shellfish tropomyosin IgE markers
- Total serum IgE
- Blood eosinophil count
Why people order this test
- Evaluate a suspected reaction after eating clams
- Assess shellfish sensitization before expanding the diet
- Distinguish mollusk from crustacean reactivity
- Support allergy action planning
- Provide objective data for a provider review
How to prepare
No fasting is usually needed for this allergy blood test, and one blood draw is sufficient. Follow the instructions supplied by the laboratory and inform the collector of any medications or past reactions.
Understanding your results
Results typically arrive within one to three business days. A detected response suggests sensitization to clam proteins, but the clinical significance depends on your history. A healthcare provider should interpret the result and discuss whether avoidance or further evaluation is appropriate.
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Frequently Asked Questions
Is a clam allergy the same as a shrimp allergy?
No. Clams are mollusks and shrimp are crustaceans, though some proteins such as tropomyosin can overlap and cause cross-reactivity.
Can I eat other shellfish if I am allergic to clams?
That decision depends on your specific sensitivities and history. A healthcare provider should advise before you try other shellfish.
Do I need to fast?
Fasting is not required for allergy blood testing unless the lab provides other instructions.
How quickly can a clam allergy reaction occur?
Food allergy reactions often begin within minutes to a couple of hours after eating, though timing varies. Seek urgent care for severe symptoms.
Does cooking destroy clam allergens?
Cooking does not reliably remove shellfish allergens, and reactions can occur with cooked clams as well.
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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