Procedures and investigations to assess workers’ health in order to detect and identify an abnormality. The results of surveillance should be used to protect and promote health of the individual, collective health at the workplace, and the health of exposed working population. Health assessment procedures may include, but are not limited to, medical examinations, biological monitoring, radiological examinations, questionnaires or a review of health records.
(Source: ILO. 1997, Technical and Ethical Guidelines for Workers Health Surveillance. OSH No. 72)