The COVID-19 pandemic exposed gaps in diagnostic testing capacity worldwide, which disproportionately impact communities in low- and middle- income countries (LMICs). A staggering 81% of the population in LMICs don’t have access to many of the most simple diagnostic tests (Lancet, 2021). UNICEF has developed the Let’s Test Toolkit (2023) to support individuals and organizations engaged in health advocacy in LMICs with materials informed by global research and global health best practices for advocacy and social behavior change.