Background: The Learning Disability Screening Questionnaire (LDSQ) has been shown to have high sensitivity and specificity to identify those who are likely to meet intellectual disability diagnostic criteria (McKenzie, et al. [McKenzie K., 2015]). However, there is no independent research to date to support these findings. Materials and Methods: An archival research design was used, utilizing data from diagnostic tools including the LDSQ, Wechsler Adult Intelligence assessments and Adaptive Behavior Assessment System Second Edition (ABAS-II) scores. Results: Sensitivity and specificity values derived here were lower than those reported by (McKenzie, et al. [McKenzie K., 2015]). Only IQ, not adaptive/social functioning, was found to be an accurate predictor of the LDSQ score. Conclusions: Results indicate limited validity in using (McKenzie, et al. [McKenzie K., 2015]) proposed cut-off scores. The authors have expressed caution around using the LDSQ in isolation to identify those with an intellectual disability.