Health surveillance is necessary when it’s indicated from an assessment (done by DOSH registered Assessor or instructed by DOSH officer), which is done for the protection of the health of workers exposed or likely to be exposed to chemicals hazardous to health.

Health surveillance programme means any examination and investigations which may be necessary to detect exposure levels and early biological effects and responses, and includes biological monitoring, biological effect monitoring, medical surveillance, enquires about symptoms of occupational poisoning or occupational disease and review of records and occupational history.