This test method is a quantitative ELISA (Enzyme-Linked Immunosorbent Assay) designed to detect and measure total milk proteins (including casein, beta-lactoglobulin, and other whey proteins) in food products, ingredients, environmental swabs, and CIP (clean-in-place) rinse waters. It is used by food manufacturers to prevent milk allergen cross-contact, verify cleaning procedures, and comply with allergen labeling regulations.