Appendix A to federal OSHA’s 1978 lead standard (current today) provides that blood lead level (BLL) of workers, both male and female, who intend to have children should be maintained below 30 micrograms per deciliter (ug/dL) “to minimize adverse reproductive health effects to the parents and to the developing fetus.” Many OHS pros believed back in the day that a BLL < 30 ug/dL was unrealistic with hierocracy of controls available at the time.
Appendix A to MIOSHA’s (Michigan OSHA) December 12, 2018, lead standard states “The blood lead levels of female workers who are pregnant should be maintained below 5 ug/dL at all times to prevent adverse health effects to the developing fetus.”