Abstract Introduction In emergency and critical-care medicine, focused cardiac ultrasound (FoCUS) is indispensable for assessing a patient’s cardiac status. The aim of this study was to establish and validate a peer-to-peer–supported ultrasound course for learning FoCUS-specific skills during undergraduate studies at a German university. Methods A 1-day, 12 teaching units training course was developed for students in the clinical section of medical college, with content based on the current national guidelines. A total of 217 students participated in the study (97 in the course group and 120 in the control group). The course and the participants’ subjective assessment of improved skills were evaluated using a questionnaire (7-point Likert scale; 7 = complete agreement and 1 = no agreement at all). Objective learning gains were assessed by tests before and after the course. These consisted of a test of figural intelligence (eight items) and a test of technical knowledge (13 items). Results The course participants experienced significant improvement (P