The urine test panel is used to determine the urine test result by observing whether a purple strip appears in the control area and the test area. The urine test panel is a convenient and quick test strip that can detect whether or not a drug is used through urine alone. The urine test panel is based on the principle of immune competition, with two areas on the panel that have drug-specific antigens and competing antibodies. If the person being tested has recently used drugs, the immune cells in the body will produce antibodies specific to that drug, and the antibodies themselves are a special protein that cannot be absorbed by the body and are excreted into the urine. The collected urine containing drug metabolites spreads on the urine test panel and competes with the antibodies on the panel itself, specifically binding the antigen and showing a positive result with only a purplish-red band in the test area. Conversely, if the person being tested is not using drugs, the antibodies on the urinalysis panel are not competing and two bands are present on the panel, resulting in a negative result.