Hazardous Substance Uptake Testing

Exposure Verification · Exposure Verification overview

Hazardous substance uptake testing covers the CMR and reactive-substance subset of biological monitoring — substances where the consequence of uncontrolled exposure is severe enough that biomonitoring is the default rather than exceptional.

CMR substances under COSHH

Category 1A and 1B carcinogens, mutagens and reproductive toxicants require exposure to be prevented or, where not reasonably practicable, controlled to as low a level as reasonably practicable. Biomonitoring evidences the residual uptake. UK-relevant examples include benzene, hexavalent chromium, cadmium and certain process intermediates.

Reactive and sensitising substances

Isocyanates (MDI, TDI, HDI, IPDI), reactive dyes, acid anhydrides and certain epoxy amines are respiratory and/or skin sensitisers. Biomonitoring of urinary diamines (for isocyanates) or specific protein adducts is the recognised verification approach.

Programme governance

Programmes for CMR and sensitising substances typically run at higher frequency (quarterly), with documented review triggers at lower fractions of the BMGV/BEI than for non-CMR substances, and explicit medical surveillance integration.