Study Finds NHS Diagnoses May Reach Few South London Teens With Mental Disorders

A recent study published in The Lancet Regional Health—Europe suggests that fewer than one in 15 young people in south London estimated to have a mental health disorder may have received a formal diagnosis from National Health Service mental health services. Investigators from the Institute of Psychiatry, Psychology & Neuroscience at King’s College London conducted the research to understand how frequently adolescents receive clinical diagnoses, which serve as an important pathway to recommended evidence-based treatments.

Examining Electronic Records and Population Estimates

To conduct the investigation, researchers analyzed electronic health records from NHS mental health services spanning the years between 2009 and 2024. They compared the number of diagnosed 17-year-olds with general population figures from the Office for National Statistics. Furthermore, the team evaluated these numbers against epidemiological estimates derived from interviews with more than 2,000 young participants in the Environmental Risk Longitudinal Twin Study. These interviews were weighted to reflect the demographic characteristics of 17-year-olds living in south London.

The analysis revealed that the proportion of 17-year-olds in the region receiving any mental health disorder diagnosis from NHS services rose from 2.6% in 2009 to 4.4% in 2024. When examining five specific conditions assessed by the twin study—specifically depression, generalized anxiety disorder, post-traumatic stress disorder, conduct disorder, and attention deficit hyperactivity disorder—the authors estimated that fewer than one in 15 individuals meeting criteria for any of these disorders received a corresponding NHS diagnosis across the study period.

Potential Barriers to Care and Diagnosis

Lead author Dr. Stephanie Lewis noted that while it is encouraging that more adolescents are receiving diagnoses over time, most young people meeting disorder criteria still do not receive a formal diagnosis from these specialized services, even when they have had prior healthcare contact for their symptoms. The data indicated that diagnosis rates varied by demographic factors. Among individuals estimated to have a disorder who had consulted a healthcare professional, girls were less likely than boys to receive a diagnosis. Similarly, young people from Black, Asian, mixed, or other ethnic backgrounds were less likely to be diagnosed compared to white peers.

The study authors pointed out that part of the diagnosis gap occurs because many young people with symptoms do not seek help from any health professional, potentially due to hurdles like uncertainty about where to find support, confidentiality worries, or logistical challenges. However, this factor does not fully account for the discrepancy. Even among help-seekers who consulted general practitioners or counselors, fewer than one in four received an NHS mental health diagnosis. Researchers suggested this may point to healthcare system barriers, including high access thresholds, limited service capacity, time constraints, or clinical complexities.

Clinical Implications and Expert Perspectives

Senior author Professor Andrea Danese emphasized that formal diagnoses matter because state-funded treatments are typically disorder-specific, meaning adolescents require accurate identification to receive targeted care. The study authors noted that their findings align with broader data, such as the STADIA trial, which observed that around one in eight children referred to community mental health services in England received a recorded diagnosis within a year despite high screening probabilities for common disorders. Experts underline the ongoing need to invest in assessment capacity to ensure vulnerable young people successfully connect with appropriate mental healthcare resources.

• Study published in The Lancet Regional Health—Europe by King’s College London researchers.
• Evaluated electronic health records from 2009 to 2024 against population and epidemiological data.
• Highlighted potential healthcare system and demographic barriers affecting adolescent mental health diagnoses.