Introduction Early detection and intervention in psychotic disorders are public health issues that have led to the creation of specific care systems in France, the visibility of which is still debated. Moreover, these services are often concentrated in adult rather than child psychiatry, which may increase the duration of untreated psychosis. Methods The main objective of this study was to take stock of the care provided in the adolescent unit of the Candélie hospital (Lot-et-Garonne, France) in 2023 and the proportion of adolescents aged over 15 diagnosed with a mental health condition at risk who were followed up. The second objective was to propose an experimental approach to improving care for this group of patients by introducing an advanced practice nurse. Results The results of the retrospective study carried out in 2022 show that staffing levels and care units in adolescent medicine are saturated. Depending on the system, between 19% and 39% of patients are classified as mentally vulnerable. The construction of an Ishikawa diagram highlights three major issues on which the advanced nurse practitioner could intervene: support for one of the systems under particular pressure (RESEDA), the resumption of part of the medical activities given the shortage of doctors, and the child psychiatry-adult psychiatry relay. Conclusion Restructuring existing systems to include initial consultation and monitoring of these adolescents and their families by advanced practice nurses would reduce the duration of untreated psychosis and allow earlier intervention with these adolescents.