Articles

Resources · Resources overview

Technical articles on workplace biological monitoring, occupational biomonitoring, urine exposure testing and biological exposure index interpretation — written for UK H&S managers, occupational hygienists and compliance teams.

Biological monitoring vs air monitoring

Air monitoring evaluates control performance at source; biological monitoring evaluates absorbed dose in the worker. They answer different questions and are complementary, not interchangeable. See the overview at /biological-monitoring and the verification approach at /exposure-verification-testing.

Understanding urine biomonitoring

Urine is the dominant biomonitoring matrix because most workplace substances produce water-soluble metabolites and collection is non-invasive. The matrix-level overview lives at /urine-biomonitoring, with collection logistics at /workplace-urine-testing and timing rationale at /pre-and-post-shift-testing.

What biological exposure indices mean

BEIs (ACGIH) and BMGVs (HSE) are advisory reference values derived from the dose-response relationship between airborne exposure at the OEL and the resulting biomarker concentration. They are interpretation benchmarks, not statutory limits. Full treatment at /biological-exposure-indices and /biological-monitoring-guidance-values.

How metabolite testing works

Most BMGVs and BEIs are expressed in terms of metabolites because the parent compound is too short-lived in urine to measure reliably. The mechanism — phase I oxidation, phase II conjugation, renal excretion — is covered at /urinary-metabolite-testing.

Why end-of-shift sampling matters

Sampling timing is biomarker-specific. Most VOC metabolites are end-of-shift; metals are end-of-shift end-of-week or pre-shift next morning. Wrong-timing samples are uninterpretable. See /pre-and-post-shift-testing and /biological-monitoring-sampling-strategy.

Biological monitoring for spray painters

Spray painting is the highest-risk routine isocyanate task in UK industry. Urinary diamine biomonitoring (MDA, TDA, HDA) is the recognised verification method. Full guidance at /spray-painting-biological-monitoring and /biological-monitoring-spray-booths.

Solvent exposure and urine testing

Solvent metabolites quantify combined inhalation and dermal uptake — the key advantage over air sampling for skin-notated substances. Substance-specific pages at /benzene-urine-testing, /toluene-urine-testing, /xylene-urine-testing, /styrene-urine-testing.

Interpreting biological monitoring results

Cohort statistics — geometric mean, 90th percentile — are more informative than individual results for control-adequacy questions. Creatinine correction, confounder documentation and the right reference value all matter. Detailed treatment at /biological-monitoring-interpretation.

Occupational hygiene biomonitoring explained

Biological monitoring sits within the COSHH framework as a verification tool, not a control. Programme governance, sampling strategy and review triggers are covered at /biological-monitoring-and-coshh and /biological-monitoring-programmes.