This study is a single center, non-equivalent comparison group, pre-post study in a tertiary pediatric emergency department in Switzerland. the study will compare the control and experimental groups on outcome measures before (12-month period) and after (6-month period) the intervention consisting of the implementation and use of the evidence-based mobile app-the ''Patients In My Pocket in my Hospital'' (PIMPmyHospital) app.

The primary outcome will be the mean elapsed time in minutes between the delivery of lab results and the emergency department caregivers accessing them before (i.e., on the institutional electronic medical records) and after the implementation of the app (i.e, directly on the app).

The study objective is to evaluate whether the use of the PIMPmyHospital app alters emergency departments (ED) physicians and nurses' temporal efficiency to learn about laboratory results more quickly while actively working in an ED. Temporal efficiency will be assessed by measuring the time between the release of the laboratory results in the clinical information system and their acknowledgement by these clinicians. Information regarding the app has been published previously (doi.org/10.3390/jpm12030428).

The investigators will conduct an 18-month, single center, non-equivalent comparison group, pre-post study. The study will compare the control and experimental groups on outcome measures before (12-month period) and after (6-month period) the intervention consisting of the use of the app. The study will take place in the pediatric ED of a tertiary referral and major trauma hospital in Switzerland, with an annual volume of 35,000 visits.

Eligible participants will be postgraduate residents pursuing a <6-year residency in pediatrics, pediatric emergency medicine fellows, and registered nurses from the pediatric ED (aged > 18 years). Written informed consent will be obtained from each participant in the interventional group after full information disclosure prior to study participation.

Before the implementation of the app, electronic medical records (EMR)-based data from the past 12 months will be collected retrospectively. These data include the times (i.e., HH:MM:SS) that results issued by the central laboratory were available on the institutional's EMR, as well as the times at which these results were accessed by caregivers via conventional computerized workstations. (ii) After the implementation of the app, data will be collected prospectively over a 6-month period of use. This will include the times (HH:MM:SS) when the results issued by the central laboratory are made available on caregivers' mobile app and access times, as well as concurrent or preferred access times on the conventional computerized workstations should this occur. Individual acceptance of the app on the first day (a priori), at 1 week, and then on the last day of the intervention (6 months) will be evaluated through the Unified Theory of Acceptance, and Use of Technology (UTAUT). Usability of the app will be measured by the System Usability Scale (SUS).

The primary outcome will be the mean elapsed time in minutes between the delivery of the lab results and the caregiver accessing them, both before and after the implementation of the app.

Inclusion Criteria:

• Any postgraduate residents pursuing a <6 years residency in pediatrics.
• Any pediatric emergency medicine fellows.
• To be registered nurses from the pediatric emergency department.
• Participation agreement.

Exclusion Criteria:

• none

Individual Participant Data will be deidentified and the study investigators will house the data locally on REDCap hosted on secured servers at the Geneva University Hospitals. The datasets used or analyzed during the current trial will be available from the corresponding author upon reasonable request, recognizing that these data will only provide results for the current pre-post study and not for future trials that would follow. Only deidentified/anonymized data will be shared.

Available from 6 month to 5 years after trial publication.

• Data will be made available from the corresponding author upon approval of a proposal and with a signed data access agreement.
• Deidentified participant data will be made available to qualified external researchers whose proposed use of the data has been approved by their Institutional Review Board.
• Data will be made available for a specified research purpose.
• The request proposal must include a statistician.

Although neither the participants nor the study investigators can be blinded to the intervention, both will be blinded to the results of the study until their final analysis by the statistician. Participants will be informed only of the overall purpose of the study, which is to evaluate the effects of the app on quality of care, but not about the aim of reducing the time to access laboratory results to minimize bias. The statistician will remain blinded to allocation until the final analysis.