1587 Background: Mammography has decreased breast cancer mortality in the US by 40% since the 1980s; yet disparities in screening and outcomes persist in underserved populations. Many studies note language as a barrier to screening with lower mammogram completion amongst Spanish-speaking patients versus those with English language proficiency. At our health center, Spanish-speaking patients were more likely to complete screening mammography compared to patients with English proficiency (53% vs 31% in 2022). To understand this pattern and barriers and facilitators to breast cancer screening, we conducted a mixed methods rapid assessment survey as part of a quality improvement initiative. Methods: We developed a patient bilingual survey measuring knowledge, attitudes, and behaviors about breast cancer prevention and screening. We identified consecutive female patients (age 40-75 years) and extracted baseline demographic data from the electronic medical record. Surveys were distributed via our health center’s patient messaging service and responses stored on a secure platform. Data analysis included descriptive statistics, chi-squared testing between groups and qualitative analysis to identify common themes from free-text answers. Results: The overall response rate was 14% (N=732/5,332) in 30 days. Of the surveys completed, 37% were in Spanish. Spanish-speaking patients more strongly regarded mammography as safe and effective compared to English-speaking patients (p<0.001). Spanish-speaking patients were more likely to view getting a mammogram as a priority (79% vs 65% p<0.001) and noted speaking about breast cancer prevention in their communities more often (p<0.006) as an important factor. Spanish-speaking patients primarily cited cost, scheduling, and language (p<0.05) as barriers to mammogram completion, while English-speaking patients cited time constraints, transportation, and discomfort (p<0.05) more frequently. Spanish-speaking patients were more likely to prefer speaking with a trusted community member or attending health fairs than English-speaking patients (P<0.05). Conclusions: Our study demonstrates differences in attitudes, behaviors, and perceived barriers to mammography in English vs Spanish-speaking patients. The increased mammogram completion rate in Spanish-speaking patients may reflect more positive attitudes about screening and more discussion in the community amongst Spanish-speaking patients queried. Reported barriers to screening differed and will guide targeted QI interventions. We demonstrated feasibility and patient engagement in a diverse population using a message system built into our EHR in an FQHC setting. This survey study allows us to elevate patient voices, better understand gaps and preferences, and better tailor future interventions for cancer screening.