A study was conducted to present a measure of organ donation readiness. An analysis of the factor structure and a test of weak invariance were applied to cross-sectional and longitudinal data in a community-based sample of African-Americans, and a second-order structural equation was used to model the relationship between three latent factors. The findings corroborated earlier research and confirmed a second-order model structure consisting of three factors—fear, knowledge, and action—in a set of nine self-report items.