Background/Objective: Formaldehyde and xylene are routinely used in histopathology, but
reports of chemical exposure do not always include clinical measurements. The evidence
linking these agents with respiratory complaints and changes in blood counts among
laboratory personnel requires careful interpretation. To examine freely available original
studies published during 2020–2026 that assessed formaldehyde or xylene exposure and
respiratory or haematological outcomes in laboratory workers.
Methodology: A PRISMA 2020-based search strategy was developed for PubMed, Scopus
and Web of Science. Publicly accessible original papers were checked against prespecified
population, exposure and outcome criteria. Complete subscription-database screening,
duplicate reconciliation and independent assessment remain outstanding; this manuscript
therefore presents an evidence-verified synthesis rather than a completed systematic search.
Results: Four relevant open-access investigations were verified. Two pathology-laboratory
studies described respiratory complaints in relation to formaldehyde exposure. One
investigation of university laboratory staff found selected blood-count differences among
workers assigned formaldehyde exposure, while another study, including an anatomicpathology subgroup, reported more irritation and allergic symptoms but no significant
differences in pulmonary function or complete blood counts. The verified studies did not
isolate the effects of xylene on either outcome.
Conclusions: Recent evidence is more consistent for irritant and upper-airway symptoms
during formaldehyde exposure than for persistent impairment of lung function or
haematological toxicity. Xylene-specific effects cannot be estimated from the verified
outcome studies. A complete systematic search and documented appraisal are necessary
before journal submission.