The Effect of a Clinical Decision Support for Pending Laboratory Results at Emergency Department Discharge.

Background: Health care systems often implement changes within the electronic health record (EHR) to improve patient safety and reduce medical errors.

Objective: To compare the proportion of emergency department (ED) encounters with laboratory tests resulting subsequent to patient discharge before and after a clinical decision support was implemented.

Methods: In 2015, our institution added an EHR dialogue when placing ED discharge orders, requiring providers to declare whether all laboratory results had been reviewed. To determine the effectiveness of this initiative, we searched the EHR to identify the proportion of ED encounters with laboratory tests resulting after discharge in pre- (January to June 2015) and post-intervention (January to June 2016) periods.

Results: There were 67,287 discharged patients during the study periods. In the pre- and post-intervention periods, respectively, 6.9% (95% confidence interval [CI] 6.7-7.2%) and 7.9% (95% CI 7.6-8.2%) of encounters had laboratory tests resulting after discharge, with an absolute difference of 0.9% (95% CI 0.5-1.3%). Of these patients with laboratory tests resulting after ED discharge, in 92% the provider inaccurately marked "yes" or "not applicable" to the EHR dialogue prompt.

Conclusions: This workflow intervention was associated with an increase in the proportion of laboratory tests resulting after ED discharge; inaccurate answers to the EHR dialogue were pervasive. EHR workflow interventions do not always accomplish their intended goals, and their implementation should be considered thoughtfully.