WS/T 574-2018 "Purified Water for Clinical Laboratory Reagents" standard specifies the requirements, confirmation, test methods and monitoring Frequency of purified water used in clinical laboratories for the preparation of general experimental reagents, the re-dissolution of calibrated products and quality control products. The standard specifies that purified water refers to water that does not contain impurities prepared by reverse osmosis (RO), distillation, ion exchange and other methods. Its resistivity should generally be greater than 0.1 MΩ · cm (25 ° C), that is, the conductivity is less than 10 μS/cm (25 ° C). This standard does not apply to purified water for special experimental purposes. The requirements for special clinical experimental water should be treated with reference to relevant standards and specific requirements. Stability and accuracy of water quality during preparation and analysis of clinical laboratory reagents.