Labor and delivery units are high-risk care environments. Based on a retrospective review of obstetrical adverse events occurring at one German hospital in 2018, researchers created a matrix of preventable factors contributing to adverse events. Six categories of preventable events were identified (peripartum therapy delay; diagnostic error; inadequate maternal birth position; organizational errors; inadequate fetal monitoring; medication error) and 19 associated risk factors, including language barriers, missed diagnosis of a preexisting condition, and on-call duty.