You must provide health surveillance when exposures are at or above the exposure action value (EAV) and in other circumstances where there is risk, for example, after diagnosis of HAVS and exposure continues but below the EAV.
Health surveillance can simply involve a short set of questions until, for example, signs or symptoms are detected and reported.
A health surveillance scheme must include access to a competent occupational physician. Make sure that your providers have the right qualifications and training and that you will:
Further guidance is available here.