The US FDA requires the following label claim for enrofloxacin: “Not for use in dairy cattle greater than 20 months of age. Use of enrofloxacin in this class of cattle may cause milk residues.” The Charm Enrofloxacin Test is sensitive to meet and EU (100 ppb^†) regulatory requirements

^†-EU MRL is 100 ppb total sum of enrofloxacin and ciprofloxacin as marker residues of which approximately 8% is enrofloxacin and 80% is ciprofloxacin in bovine milk.