CLED Agar is used for the detection of urinary pathogens. Its low content in electrolytes prevents the swarming of Proteus spp. L-Cystine promotes the formation of dwarf colonies. Pancreatic Digest of Gelatin, Casein Digest Peptone, and Beef Extract supply nitrogenous sources, carbohydrates, vitamins, and minerals. Lactose is the fermentable carbohydrate. Bromothymol Blue is the pH indicator that shifts to yellow upon acidification of the medium due to Lactose fermentation, or to blue upon alkalinization due to L-Cysteine decarboxylation. Agar is the gelifying agent.