The RAST blood test is the most accurate to determine what food allergies you may have. It covers 3 different panels of food, I have had them, and they definitely show things you are allergic to. I would ask your doctor to have the lab do this.
Being allergic to seafood is nothing to take lightly, I would watch very carefully what you ate in that area.
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There are some websites that show cross-reactive foods .. I'm not too sure, but pls be careful with all fish if you are allergic. That would be my opinion. You can see an allergist and he/she will give you skin/blood tests to help you find out, too.
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C~