The increase in youth's self-identification as trans in the United States and Canada has created new urgency in schools to meet the needs of these students, yet education survey researchers have yet to find ways to assess their educational outcomes based on sex and gender. In this critical systematic review, I provide an overview of surveys from 2009-2019 that have been utilized to assess the sex and gender identity of trans youth. Findings suggest a range of measurement approaches and types of research interests, as well as important aspects that were absent from the surveys. Recommendations for those who currently or plan to engage with survey research that includes gender identity are included.