Johnston D, et al. - In this cross-sectional diagnostic study of 63 children (aged 6–17 years), researchers assessed the accuracy of motor assessment tools listed in Fetal alcohol spectrum disorder: a guideline for diagnosis across the lifespan (Canadian Guideline) for the diagnosis of fetal alcohol spectrum disorder (FASD), specifically the diagnostic accuracy of motor assessment tools and subtests and the accuracy of multiple subtests vs total scores, as well as accuracy of alternate cut-offs. For the Movement Assessment Battery for Children, 2nd edition (MABC-2), Bruininks-Oseretsky Test of Motor Proficiency, 2nd edition Short Form (BOT-2SF) and Beery-Buktenica Developmental Test of Visual Motor Integration, 6th edition (BeeryVMI-6), diagnostic accuracy and alternate cut-offs were calculated. For FASD diagnosis, the BOT-2SF was an inaccurate assessment tool. Although its sensitivity was still low, the MABC-2 total motor score was the most accurate using current guidelines. The outcomes of this investigation support and clarify the Canadian Guideline that could lead to FASD being diagnosed more accurately.