The psychometric integrity of a curriculum-based measure to screen for academic giftedness (Monitoring Instructional Responsiveness: Reading [MIR:R]) was evaluated by examining its ceiling, item gradient, and predictive capacity using 460 fourth grade students. Eighty fourth graders (17.39%) scored one standard deviation above the MIR:R mean. Ten fourth graders (2.17%) scored two or more standard deviations above the mean, indicating an adequate ceiling. Item gradients were sufficient, that is, one raw score change produced less than one-third of a standard deviation change in standard deviation units. The MIR:R accurately screened students who performed in the "advanced" range on an end-of-the-year measure (i.e., Tennessee Comprehensive Assessment Program [TCAP]). Results of a chi-square indicated that 78.3% were identified as non-gifted by both the TCAP and MIR:R and 5.9% were identified as gifted.