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109 Posttraumatic stress in young children | Chapter 6 Strengths of the study are the focus of the under-researched population of (very) young children and the use of a combination of clinical interviews to measure (several variations of) PTSD diagnoses. Furthermore, research on the comparison of three diagnostic PTSD algorithms for young children is scarce. With this study we aimed to contribute to the knowledge on this topic and to expand the research base. Conclusions Our results suggest that the DSM-5 subtype for PTSD in children 6 years and younger is an important improvement in identifying young children with PTSD compared to the DSM-IV algorithm. Nevertheless, clinicians should still be aware that some children with subsyndromal PTSD who may need trauma-focused treatment can stay unidentified. Acknowledgements We would like to thank Irma Hein for her help with the language corrections and Renée Beer for her advice and help with the development of the interview and the translation of the DIPA questions. We also thank Jeanine Suurmond for her advice and help with the qualitative analysis and Merlijn Meynen for his help with the pilot study. Finally, we would like to thank Dr. J.S.K. Luitse, Emergency Department AMC, Prof. J.C. Goslings, Trauma Unit Department of Surgery AMC, Prof. emeritus H.A. Heij, Pediatric Surgical Center of Amsterdam AMC and VUmc, and Dr. F.W. Bloemers, Department of Surgery VUmc for their kind cooperation and for enabling us to conduct this study.