Colorectal cancer screening test exposure patterns in US adults 45 to 49 years of age, 2019-2021.

Several organizations now recommend that individuals at average risk for colorectal cancer (CRC) begin screening at 45 rather than 50 years of age. We present contemporary estimates of CRC screening in newly eligible adults aged 45 to 49 years between 2019 and 2021. Nationally representative prevalence estimates and population number screened were estimated based on the National Health Interview Survey. A logistic regression model assessed CRC screening prevalence differences by survey year and sociodemographic characteristics. In 2021, 19.7%-that is, fewer than 4 million of the eligible 19 million adults aged 45 to 49 years-were up-to-date on CRC screening. Screening was lowest in those who were uninsured (7.6%), had less than a high school diploma (15.4%), and Asian (13.1%). Additionally, fecal occult blood test and/or fecal immunochemical testing was underused, with only 2.4% (<460 000 people) reporting being up-to-date with screening using this modality in 2021. CRC screening in eligible young adults remains low. Concerted efforts to improve screening are warranted, particularly in underserved populations.