Test library
Crayfish Allergy Test
This blood test measures IgE antibodies to crawfish proteins, helping evaluate shellfish reactions that may occur after eating crawfish, also called crayfish.
Order Crawfish 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 Crawfish Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The crawfish allergy test detects immunoglobulin E antibodies against proteins from crawfish, also known as crayfish. Crawfish are freshwater crustaceans and share allergens with other shellfish such as shrimp and crab. The test is intended for people who suspect reactions after eating crawfish. A healthcare provider interprets the result with your reaction history.
What this test measures
This test measures allergen-specific immunoglobulin E against crawfish proteins. As crustaceans, crawfish contain tropomyosin, a muscle protein that is a major allergen across shrimp, crab, lobster, and related species. Reactions can include hives, swelling, oral itching, digestive symptoms, or more serious effects. The immunoassay reports a quantitative antibody level and an IgE class for crawfish.
A blood sample is collected by venipuncture at a partner laboratory and analyzed with an immunoassay. Results are reported in kilounits per liter, and total IgE and eosinophil counts may be included as supporting context. Because tropomyosin is shared among crustaceans, a crawfish result may accompany reactivity to shrimp or crab, and a broader shellfish panel can show the overall pattern. Mollusks such as clams are a separate group.
People order this test after a suspected reaction to crawfish or when they need clarity about shellfish cross-reactivity. It can support dietary planning and allergy management discussions with a clinician. Testing identifies sensitization rather than confirming a clinical allergy and does not predict reaction severity, so a qualified healthcare provider should interpret the results.
- Crawfish (crayfish)-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 crawfish
- Assess cross-reactivity with shrimp, crab, and lobster
- Support shellfish avoidance planning
- Investigate skin or digestive symptoms after seafood
- Provide objective data for an allergy care discussion
How to prepare
No fasting is required for this allergy blood test, and a single blood draw is typically enough. Follow the instructions provided with your order and tell the collector about medications and any prior reactions to shellfish.
Understanding your results
Results are typically reported within one to three business days. A detected response indicates sensitization to crawfish proteins, while the clinical significance depends on your symptoms. A healthcare provider should interpret the result and discuss any dietary considerations.
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Frequently Asked Questions
Are crawfish and crayfish the same animal?
Yes. Crawfish and crayfish are different names for the same freshwater crustacean, and the test detects antibodies to its proteins.
Can I eat shrimp if I am allergic to crawfish?
Cross-reactivity is possible because crustaceans share tropomyosin. A healthcare provider should advise based on your specific results and history.
Does cooking remove crawfish allergens?
Cooking does not reliably eliminate shellfish allergens, so reactions can occur with cooked crawfish.
Do I need to fast?
No fasting is required for allergy blood testing unless the laboratory instructs otherwise.
What symptoms suggest shellfish allergy?
Hives, swelling, oral itching, breathing changes, or digestive upset after eating are possible. Severe reactions need emergency care.
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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