This test is based on clenbuterol antibodies and it is recommended for the detection of the following Beta-Agonists (% of cross-reactivity): clenbute­rol (100%), bromobuterol (100%), mapenterol (80%), mabuterol (70%) and cimbuterol (60%). The dose-response curve shows a measuring range for clenbuterol of 0.1-8 ng/ml or 5-400 pg/well. Urine can be applied directly in the test without any pretreatment (LOD 0.5 ng/ml) or to lower background, after an extraction. For faeces, feed, tissue, plasma, bile and choroid/ retina samples, simple extraction methods are described in the manual. Detection limits as low as 0.05 ng/g can be reached depending on the Beta-agonist, sample material and clean-up procedure.