Failure to follow up on test results has been linked to missed and delayed diagnoses in the ambulatory setting. Although electronic health records (EHR) hold great promise for addressing this issue, this systematic review found only modest published evidence linking EHR use to improved laboratory test monitoring. This finding corroborates other studies documenting persistent failure to comprehensively follow up abnormal lab tests and radiologic studies despite use of an EHR. The authors conclude that further research will be required to develop optimal test management systems within electronic medical records.