R-Protagen clenbuterol rapid test card, which uses immunocolloid gold technology, can quickly, semi-quantitatively and specifically detect clenbuterol in urine and tissue samples, and can directly determine the results by eyes. The detection limit is 3ppb (3ng/ml), and the detection results are accurate, with no cross-reactivity with other Beta receptor agonists. It is suitable for on-site, rapid and large-scale sample screening, with low detection cost, suitable for grassroots and non-professionals and families.