To decrease the risk of diagnostic errors attributed to incomplete recommended diagnostic tests, this study evaluated an electronic monitoring tool alerting clinicians to incomplete imaging tests for their ambulatory patients. Compared to the control group (physicians not receiving alerts for their patients), after 90-days the intervention group had a higher rate of imaging completion (22.1% vs. 18.8%); this difference was sustained throughout the 12-month follow-up period (25.5% completion in the intervention group versus 20.9% in the control group). The authors found that this change was primarily driven by completion rates among patients referred for mammography.  To fully appreciate the implications of missed test notifications to reduce the risk of delayed diagnoses, more studies are necessary.