Plaice is a saltwater fish found in the waters of the Atlantic. Specific fishes like codfish and hake, along with plaice, contain allergenic components. Allergy to the plaice fish is common in dermatitis patients and children with other food allergies. This allergy arises from the protein parvalbumin which is found in the muscle of the fish. The Allergy Plaice Fish test is conducted to calculate the number of lgE antibodies in your blood. It diagnoses the allergy and is also used in the process of treatment and post-treatment. It is also known as Allergy Plaice Fish Radio Immunosorbent.