RESUMO
BACKGROUND: Professional identity is critical to the safe and effective clinical practice of all health professions. University programs play an important role in the formation of professional identity of students, and so it essential to understand professional identity at this stage of students' development. However, the majority of research into professional identity has been conducted using the qualitative paradigm so further quantitative analysis through the use of psychometrically-sound professional identity measures is required. This study aimed to identify professional identity measures used with university students enrolled in health programs and synthesise the evidence of their psychometric properties. METHODS: The systematic review was conducted in two phases. Phase 1 involved searching five online databases for studies that used professional identity measures with student health professionals. These studies were assessed against a priori criteria for inclusion and a list of measures was identified. Phase 2 involved searching the same databases for psychometric evidence of the measures identified in Phase 1. The psychometric properties of each measure were compared against the Consensus-based standards for the Selection of Health Measurement Instruments (COSMIN) checklist. Data were narratively synthesised, and comparisons were made between measures. RESULTS: Phase 1 identified eight professional identity measures. Phase 2 identified a total of 15 studies that evaluated the psychometric properties of at least one of the professional identity measures. There was a paucity of psychometric evidence for the measures. The revised Nurses' Professional Values Scale and Macleod Clark Professional Identity Scale had the greatest volume of psychometric evidence. None of the measures fulfilled all criteria in the COSMIN checklist. CONCLUSION: There is a paucity of evidence underpinning the psychometric of professional identity measures. Evidence which uses these measures should be interpreted with caution. Further research is warranted to ensure that the results of quantitative professional identity studies are valid and reliable.