Find out whether certain hazardous substances are entering employees’ bodies during their normal work. We’ll help you plan the right sampling, arrange analysis and understand what the results mean for your controls.
Biological monitoring measures a substance, or its breakdown products, in a sample such as urine, blood or—in some cases—breath. It can help assess uptake through all relevant routes of exposure, including inhalation, skin contact and accidental ingestion.
It can show uptake through different exposure routes, including breathing a substance in or absorbing it through the skin. Used alongside your risk assessment and other exposure information, it helps you check how well workplace controls are working.
It measures exposure, not a diagnosis. A result needs to be interpreted in the context of the substance, the task and the timing of the sample.
Biological monitoring may be appropriate for a range of workplace substances where a recognised biological marker and suitable sampling method are available.
Examples can include:
Isocyanates, used in paints, coatings, foams, resins and adhesives.
Certain solvents and organic chemicals, where biological markers can help assess absorption.
Metals and other agents with recognised biological indicators, including lead where the applicable regulatory requirements are met.
Other substances where biological monitoring is recommended by HSE guidance, industry standards or an occupational-hygiene assessment.
The most appropriate approach depends on the substance, task, exposure route, timing of exposure and available biological guidance values. We will help you understand whether monitoring is suitable for your specific processes.
A typical biological-monitoring programme involves:
We review the relevant substance, workplace process, exposure routes, roles and risk information. Together, we agree who will be included, what sample type is required, when samples should be taken and the appropriate monitoring frequency.
Planning – We review the relevant substance, workplace process, exposure routes, roles and risk information. Together, we agree who will be included, what sample type is required, when samples should be taken and the appropriate monitoring frequency.
Sample collection – Samples are collected at a time that reflects the substance and potential exposure. Depending on the programme, this may involve urine, blood or another appropriate sample. Employees receive clear information about the purpose of monitoring and what is involved.
Laboratory analysis – Samples are securely prepared and sent to an appropriate laboratory for analysis of the agreed substance or biological marker.
Interpretation and follow‑up – We help you interpret the results in the context of your workplace. Where results suggest a need for action, we can support a review of controls, work practices, PPE, training, supervision or further monitoring.
The aim is to give you objective feedback on how well exposure controls work in real life—not to catch employees out.
Biological-monitoring results can help you:
Check whether exposure is being controlled effectively across real working conditions.
Identify tasks, teams or situations where substance uptake may be higher.
Review whether respiratory protective equipment, gloves, ventilation or other controls are effective.
Prioritise improvements to training, engineering controls, work practices and supervision.
Support discussions with health and safety teams, occupational hygienists, employee representatives and senior leaders.
Demonstrate that you are actively checking whether workplace controls are protecting employees in practice.
Results should always be considered as part of the wider exposure-control picture, alongside risk assessment, air monitoring where relevant and workplace observations.
We can help coordinate collection around shifts, site access and production schedules, with clear instructions for employees and managers. The collection method and location will depend on the substance, sample type and laboratory requirements
Planned health-surveillance sessions at your workplace
Practical delivery for busy, remote or multi-site workforces
Accessible local appointments for employees across the UK
Whether you are reviewing chemical controls, introducing a new process, supporting high-risk roles or investigating an exposure concern, Clarity can help you develop a biological-monitoring programme that is proportionate, practical and built around your organisation.
We will take time to understand your substances, processes, workforce and operational needs, then help you put the right monitoring and follow-up arrangements in place.
Biological monitoring measures a chemical or its breakdown products in a biological sample, usually urine or blood, to indicate how much of a substance may have entered a worker’s body through relevant exposure routes. It is used to help assess workplace exposure and the effectiveness of control measures.
It may be used where workers could absorb certain hazardous substances through inhalation, skin contact or accidental ingestion, and where a suitable biological marker and sampling method are available. Examples can include isocyanates, selected solvents, certain metals and other substances with recognised biological indicators.
For many substances, biological monitoring is not a general statutory requirement and is used as an exposure-management tool. However, specific legal requirements apply in some circumstances, including lead exposure under the Control of Lead at Work Regulations 2002. The correct approach depends on the substance, work activity, exposure level and applicable regulations.
A programme usually involves planning around the relevant substance and work tasks, collecting samples at the appropriate time, laboratory analysis, and interpretation of results alongside your risk assessment and exposure controls. Depending on the substance, samples may include urine, blood or another appropriate biological sample.
Results can provide insight into whether substances may be entering workers’ bodies despite existing controls. This can help employers review ventilation, PPE, gloves, respiratory protection, work practices, training and supervision. Results should be interpreted alongside other exposure information and do not, by themselves, diagnose illness.
The appropriate frequency depends on the substance, biological marker, exposure pattern, risk assessment and purpose of the programme. For isocyanates, HSE advises that sample timing should reflect normal work and be taken at the end of potential exposure; your monitoring plan should be designed around the specific process and control measures.
Clarity can support the planning of a biological-monitoring programme, arrange suitable sample-collection options, coordinate laboratory analysis and provide clear, actionable reporting. Delivery may include on-site clinics, mobile medical units or local clinic appointments, depending on the requirements of the programme.
Biological monitoring programmes should be delivered with clear information, appropriate consent, confidentiality and secure handling of health information. Employees should understand the purpose of monitoring, how samples and results will be used, and what information may be shared with managers. Employers receive appropriate summary and workplace-action information rather than full confidential clinical records.
Tell us a little about your workforce and what you need help with. We’ll call you back to talk through your options and the most practical way to deliver them.
Tell us your workforce size, locations and main risks. We’ll recommend a practical delivery model and respond within one working day.
Telephone
Email