This Standard specifies the requirements, test methods, label and use instructions, package, transportation and storage of a-L-fucosidase (AFU) assay kit. This Standard is applicable to reagent (kit) performing quantitative detection by CNPF (2-chloro-4-nitrophenyl-L-fucoylpyranoside) substrate method against the a-L-fucosidase in human serum or plasma; including the reagents used on the manual and semi-automatic, fully automated biochemical analyzers.