Reporting of Y Balance Test Measurement Procedures in Reliability and Validity Studies: A Scoping Review.

The Y Balance Test (YBT) is widely used to assess dynamic balance and lower-limb function in both clinical and sports settings. However, substantial variability exists in YBT measurement procedures across studies, which may complicate interpretation of the reliability and validity findings. This scoping review aimed to systematically map the reporting frequency and heterogeneity of participant characteristics and measurement procedures in studies evaluating the reliability and/or validity of the YBT. This scoping review was conducted in accordance with the PRISMA extension for Scoping Reviews and the Joanna Briggs Institute methodology. MEDLINE, CENTRAL, CINAHL, and clinical trial registries were searched from inception to 20 September 2025. Observational studies assessing the reliability and/or validity of the YBT were also included. Data on participant attributes and key measurement procedures, including practice trials, rest periods, upper-limb restrictions, heel lift allowance, and other protocol components, were extracted. A total of 32 studies involving 1701 participants were analyzed. Considerable heterogeneity was observed in the reporting of YBT measurement procedures across studies, with differences according to study design and participant characteristics. While practice trials and error criteria were frequently described, other factors that may influence outcomes, including warm-up protocols, rest periods, heel lift allowance, and trial order, were less consistently reported. Such variability may limit the interpretability and comparability of YBT findings. Notable gaps were identified in both reliability and validity studies, as well as in studies involving injured or clinical populations. These findings highlight the need for greater transparency and consistency in YBT reporting. Clearer reporting standards may improve evidence synthesis and the application of YBT findings.