Tetrazolium blue chloride is a chemical compound that is used in the diagnosis of leukemia. It is a tetrazolium salt that reacts with reduced nicotinamide adenine dinucleotide (NADH) and produces an insoluble blue product. Tetrazolium blue chloride has been shown to be effective in treating human leukemic cells by causing DNA damage, which leads to cell death. Tetrazolium blue chloride has also been found to be an anti-inflammatory agent due to its ability to inhibit prostaglandin synthesis and production of reactive oxygen species.