Diagnostic error experiences of patients and families with limited English-language health literacy or disadvantaged socioeconomic position in a cross-sectional US population-based survey

BACKGROUND: Language barrier, reduced self-advocacy, lower health literacy or biased care may hinder the diagnostic process. Data on how patients/families with limited English-language health literacy (LEHL) or disadvantaged socioeconomic position (dSEP) experience diagnostic errors are sparse. METHOD: We compared patient-reported diagnostic errors, contributing factors and impacts between respondents with LEHL or dSEP and their counterparts in the 2017 Institute for Healthcare Improvement US population-based survey, using contingency analysis and multivariable logistic regression models for the analyses. RESULTS: 596 respondents reported a diagnostic error; among these, 381 reported LEHL or dSEP. After adjusting for sex, race/ethnicity and physical health, individuals with LEHL/dSEP were more likely than their counterparts to report unique contributing factors: "(No) qualified translator or healthcare provider that spoke (the patient's) language" (OR and 95% CI 4.4 (1.3 to 14.9)); "not understanding the follow-up plan" (1.9 (1.1 to 3.1)); "too many providers… but no clear leader" (1.8 (1.2 to 2.7)); "not able to keep follow-up appointments" (1.9 (1.1 to 3.2)); "not being able to pay for necessary medical care" (2.5 (1.4 to 4.4)) and "out-of-date or incorrect medical records" (2.6 (1.4 to 4.8)). Participants with LEHL/dSEP were more likely to report long-term emotional, financial and relational impacts, compared with their counterparts. Subgroup analysis (LEHL-only and dSEP-only participants) showed similar results. CONCLUSIONS: Individuals with LEHL or dSEP identified unique and actionable contributing factors to diagnostic errors. Interpreter access should be viewed as a diagnostic safety imperative, social determinants affecting care access/affordability should be routinely addressed as part of the diagnostic process and patients/families should be encouraged to access and update their medical records. The frequent and disproportionate long-term impacts from self-reported diagnostic error among LEHL/dSEP patients/families raises urgency for greater prevention and supportive efforts.