Informed consent protects patients’ right of autonomy, as they may refuse to participate in clinical teaching. In Pediatrics, young people aged 16 or over, and with the necessary judgment, may consent; in Psychiatry, consent is also essential due to the personal nature of the subjects addressed. This study aimed mainly to assess the practical application of informed consent in medical education. An observational cross-sectional study was developed, and an interview-like questionnaire was applied to participants waiting for a scheduled consultation for themselves or the person they represented, in Pediatrics and Psychiatry. Only 54% of Pediatrics participants and 75% of Psychiatry participants stated that the physician asked them if they minded the students’ presence and an even smaller percentage from both departments affirmed that students introduced themselves as medical students and requested their consent to examine them. Patients feel satisfied to contribute to the students’ training, although a considerable percentage of them had experiences without being informed or asked for consent, which represents an evident disrespect for their autonomy. There is a need to intervene and provide an adequate education of ethical values in clinical practice to students.