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Estimates of colorectal cancer test use vary widely by data source. Medicare claims offer one source for monitoring test use, but their utility has not been validated. We compared ascertainment of sigmoidoscopy and colonoscopy between three data sources: self reports, Medicare claims, and medical records. Materials and Methods: The study population included Medicare enrollees residing in North Carolina (n = 561) who had participated in a telephone survey on colorectal cancer tests. Medicaredoi:10.1158/1055-9965.epi-07-0123 pmid:17932360 fatcat:m3zr3keqxvd5xghowqnwuqr67y