It is conducted to monitor the health of employees, timely detection of diseases, the initial forms of occupational diseases, early signs of the impact of harmful and (or) hazardous production factors on the health of workers, the formation of risk groups for the development of occupational diseases, and the detection of diseases, conditions that are Medical contra-indications for the continuation of work associated with exposure to harmful and (or) hazardous production factors, as well as work, for example nenii which necessarily conducting preliminary and periodic medical examinations (surveys) workers in order to protect public health, to prevent the occurrence and spread of disease.