EXPOSURE TO FORMALDEHYDE IN PREGNANCY

Formaldehyde is an organic compound that is often used in an aqueous solution called formalin. Formaldehyde is used widely in the manufacture of plastics and resins, and as a disinfectant and tissue preservative. There has also been concern surrounding the production of formaldehyde, as a by-product of some professional keratin-based hair straightening products, at levels in excess of occupational exposure limits.  

Epidemiological studies assessing occupational exposure to formaldehyde during human pregnancy do not demonstrate an increased risk in those adverse fetal outcomes that have been studied, however data are limited and adverse effects on the fetus cannot be ruled out, and these analyses may not reflect risk where exposure in excess of recommended limits has occurred.

As with all chemicals, unnecessary exposure to formaldehyde/formalin should be avoided. Where occupational exposure is unavoidable, precautions should be taken to ensure that any recommended PPE is used, and that exposure is well within the recommended exposure limits and not associated with toxic symptoms.

Maternal toxicity as a result of exposure in pregnancy is likely to be a major determinant of the risk posed to the developing fetus. However, due to limitations in the available data, it is not currently possible to state that an absence of maternal toxicity excludes the possibility of adverse fetal effects. Where maternal treatment is required, treatment should be the same as for the non-pregnant patient. Additionally, other risk factors may be present in individual cases which may independently increase the risk of adverse pregnancy outcome. Clinicians are reminded of the importance of consideration of such factors when performing case-specific risk assessments. Enhanced antenatal surveillance may be warranted after exposure to formaldehyde and should be decided on a case-by case basis. Discussion with UKTIS is recommended in all cases of formaldehyde exposure at any stage of pregnancy.