Now, after a cluster randomized controlled trial, eAlerts providing evidence-based guidelines on venous thromboembolism prophylaxis will be rolled out and evaluated hospital-widely.

An eAlert is displayed in the electronic patient chart if no prophylaxis has been ordered within 6 h after admission or transfer. The eAlerts provide evidence-based guidelines on venous thromboembolism prophylaxis. Now, after a cluster randomized controlled trial, the eAlerts will be rolled out and evaluated hospital-widely.

Inclusion criteria:

• all in-patients hospitalized in a ward with computerized physician order entry (CPOE),
• staying at least 24 h in a ward

Exclusion criteria:

• outpatients,
• ward without CPOE,
• patients transferred from an intervention to a control ward and vice versa