A randomized controlled intervention tested the effectiveness of a community health worker (CHW) program in increasing compliance with annual preventive exams among uninsured Hispanic women living in a rural U.S.-Mexico border area. During 1999-2000, household surveys were administered to women aged 40 and older. Uninsured women not receiving routine comprehensive preventive care were invited to participate in a free comprehensive clinical exam. Participants in the initial exam were eligible to participate in the CHW ("promotora") intervention. Women were randomized to one of two intervention arms. One arm received a post-card reminder for an annual preventive exam, the other a postcard reminder and follow-up visit by a promotora. Receiving the promotora intervention was associated with a 35% increase in rescreening over the postcard-only reminder (risk ratio [RR] = 1.35, 95% confidence interval 0.95-1.92). Using promotoras to increase compliance with routine screening exams is an effective strategy for reaching this female population. (Contains 2 tables.)