The tetracycline colloidal gold rapid detection card in poultry eggs is a rapid detection product specially designed for the detection of tetracycline drug residues in poultry eggs. It uses colloidal gold immunochromatography technology to achieve qualitative or semi-quantitative analysis of tetracycline residues in poultry egg samples in a short time. Its core principle is to use antigen-antibody specific binding reaction: the detection card contains detection lines and quality control lines coated with tetracycline-carrier protein conjugates, as well as tetracycline antibodies labeled with colloidal gold. When the sample (e.g. egg homogenate extract) is dropped into the sample well, it moves towards the test strip under capillary action. If the sample contains tetracycline residues, it will bind to the colloidal gold-labeled antibody, preventing it from binding to the antigen of the detection line, resulting in color development or no color development of the detection line. The result is judged by comparing it with the quality control line. Compared with traditional detection methods (such as high performance liquid chromatography, etc.), it has significant advantages: the detection speed is fast, usually 10-15 minutes to produce results; the operation is simple, no professional training is required, and the user can directly follow the instructions; the sensitivity is high, and low concentration residues can be detected; the accuracy is good, and the correlation with standard methods is high; the portability is strong, and it is suitable for on-site rapid screening outside the laboratory, such as production bases, market sampling and other scenarios. At present, the test card is widely used in raw material control of poultry and egg production enterprises, market rapid screening by regulatory authorities, incoming inspection in farmers' markets and catering industries, etc., to help detect unqualified eggs in a timely manner, reduce the threat of drug abuse to consumer health, and provide efficient tools for food safety supervision.