Gulf Flounder-Specific IgE Panel

What this test measures

Fish allergy is usually driven by parvalbumin, a muscle protein found across many fish species. Gulf flounder is a flatfish commonly eaten in coastal cooking, and reactions to it can range from oral itching to hives, vomiting, or more serious symptoms. The test measures IgE antibodies directed against flounder proteins.

Only a serum sample from a routine blood draw is needed. The laboratory reports Gulf flounder-specific IgE, total IgE, and a semiquantitative class. Some panels add markers such as parvalbumin and related fish allergens to help a clinician assess whether reactions are likely to extend to other species.

Testing is typically requested after a clear reaction to flounder or another fish, or when a broader seafood allergy panel is being assembled. Because fish allergies tend to persist, the laboratory report is an important part of the information a healthcare provider uses for counseling.

• Gulf flounder-specific IgE antibody
• Total serum IgE
• Parvalbumin IgE (major fish allergen)
• Cod or white fish IgE cross-reactant
• Salmon IgE cross-reactant
• Tropomyosin IgE cross-reactivity
• IgE reactivity class for flounder extract

Why people order this test

• Evaluate hives or swelling after eating flounder
• Check whether reactions may extend to other fish
• Support safe seafood choices with a healthcare provider
• Document sensitization before a supervised food challenge
• Add flounder to a broader seafood allergy panel

How to prepare

No fasting is necessary, and the blood draw does not need to be timed after a meal. A laboratory collects the sample. Follow the collection instructions provided by the laboratory.

Understanding your results

Reports are usually available within one to three business days. A detectable IgE level indicates sensitization to flounder proteins, and the clinical significance depends on symptoms and exposure as assessed by a healthcare provider.