Care left undone (also called missed care, unfinished care, and implicitly rationed care) is associated with lower perception of safety culture and increased adverse events. In this study, more than 2,200 pediatric nurses were asked about care tasks left undone in their most recent shift and a variety of environmental factors (e.g., perception of their work environment, risk of burnout). The most frequently omitted task was comfort/talk with patients, and the least frequently omitted task was pain management.