Workplace Biological Monitoring
Biological Monitoring · Biological Monitoring overview
Workplace biological monitoring programmes verify that the combined effect of engineering controls, RPE, PPE and work practice is keeping absorbed dose below health-based reference values across a UK workforce.
Scoping the cohort
A workplace programme begins with a written exposure assessment that identifies similar exposure groups (SEGs) — workers grouped by task, location and substance exposure profile. Each SEG is sampled separately so that controls can be evaluated at the level at which they actually operate.
Cohort size is set by statistical considerations: a minimum of six to ten workers per SEG is typical for routine verification, with larger numbers where exposure variability is high or where the reference value is close to the action limit.
Sampling logistics
Sample timing must align with the biomarker half-life. Most solvent metabolites are end-of-shift; some metals are pre-shift next morning; cumulative markers such as blood-lead can be sampled at any point in the shift. Sample containers must be the type specified by the laboratory (acid-washed for metals, preservative-free for most organics), labelled with worker ID, date, shift and last-exposure time.
Chain of custody must be maintained from collection through to laboratory receipt — sample integrity is essential for medico-legal defensibility.
Communication and consent
Workers must be informed of the purpose of the programme, what is measured, how results will be used, who will see them and how long they will be retained. Individual results are confidential occupational health information; only de-identified group statistics are released to the employer.
Frequently asked questions
Who organises workplace biological monitoring?
Typically the employer's occupational hygienist or appointed occupational health provider, working with a UKAS-accredited analytical laboratory.
How are individual results communicated?
Confidentially, by the occupational health professional, with written interpretation against the relevant BMGV or BEI.
Related pages