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Despite significant progress in reducing early childhood deaths from acute diarrhea, morbidity and mortality remains high among older children and adults with 5.7 billion cases and 1.1 million deaths globally in 2019. Rehydration remains the most important treatment for acute diarrhea in all populations, with intravenous fluids recommended for patients with severe dehydration and oral rehydration solution for those with mild to moderate (some) dehydration. While several clinical diagnostic models exist for assessing dehydration in young children, no validated tools exist for older children and adults. Recently, two clinical diagnostic models (the full and simplified NIRUDAK models) were derived and incorporated into a mobile health (mHealth) Clinical Decision Support Tool (CDST). In addition, a paper-based score was developed based on the simplified NIRUDAK model, which does not require a …