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Many studies have shown an association of low vitamin D levels (defined by the National Academy of Medicine as 25-hydroxyvitamin D [25(OH)D] levels <20 ng/mL [49.9 nmol/L]) with many disease states and adverse clinical outcomes. Despite little evidence showing routine screening and supplementation provide any benefit, the frequency of vitamin D screening has increased dramatically in the last 10 years. In 2014, the USPSTF found insufficient evidence of either harms or benefits to make a definitive recommendation for screening in community-dwelling, nonpregnant adults (NEJM JW Gen Med Jan 15 2015 and Ann Intern Med 2015; 162:133). The USPSTF now updates that recom…