Health surveillance: monitoring the harm that builds slowly

Health surveillance is systematic checking of people exposed to a known workplace hazard, to catch harm early enough that it can be stopped. It is not a general wellbeing check and not an annual medical — it is targeted at specific exposures with specific effects, and it exists because the conditions it looks for develop silently and are irreversible once established.

Who needs health surveillance

• Anybody exposed to noise above the action level, where hearing loss accumulates unnoticed until it is permanent.
• Users of vibrating tools, for hand-arm vibration syndrome, which begins as symptoms workers rarely report.
• People working with respiratory sensitisers — flour, wood dust, isocyanates, solder fume.
• Those exposed to substances causing skin disease, where regular skin checks catch dermatitis early.
• Workers exposed to specific hazardous substances with a recognised disease and a valid detection technique.
• Not everybody, and not as a substitute for controlling the exposure in the first place.

What it involves and what it does not

Usually a questionnaire, a simple test appropriate to the hazard — audiometry, a skin check, lung function — and escalation to an occupational health professional where something is found. The employer learns whether the person is fit for the role and what adjustments are needed; the employer does not learn the clinical detail. That boundary is not a formality: medical results are health data of the most sensitive kind, and the usual failure is a well-meaning manager holding a report they should never have received.

Surveillance is not a control. Finding early hearing loss in three people tells you the noise controls are inadequate — the correct response is to fix the exposure, not to monitor the damage more attentively. An organisation with good surveillance and unchanged exposure is documenting harm rather than preventing it.

Running a programme properly

1. Start from the risk assessment, since surveillance is a response to an identified exposure rather than a standalone exercise.
2. Set the frequency by the hazard and the guidance, typically annually with a baseline on starting the role.
3. Keep a health record for each person — dates, outcomes, fitness conclusions — separate from clinical notes.
4. Act on findings across the group, because an individual result is a signal about the control measures.
5. Retain records for the period the regulations require, which for some exposures runs decades after employment ends.
6. Tell people what it is for, as participation is far better when the purpose is understood rather than assumed to be surveillance of them.

Ettex Records holds the health record — who, which hazard, dates, outcome, next due — without the clinical detail that should never reach the employer, and with the review dates that keep a programme running rather than lapsing. The exposure assessments those checks respond to belong beside them, since one is meaningless without the other.