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This test detects IgE antibodies against brewer's yeast proteins, indicating a potential yeast allergy. Brewer's yeast is used in fermented foods and beverages including beer, wine, and some breads. A positive result suggests you may experience allergic symptoms—ranging from mild itching or hives to gastrointestinal symptoms—after consuming yeast-containing foods. This test helps identify yeast as an allergy trigger, useful for those with suspected yeast sensitivity.