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BACKGROUND: Vitamin D is important for bone health; in 2014 it was the fifth most commonly ordered laboratory test among Medicare Part B payments. OBJECTIVES: The aim of this study was to describe vitamin D status in the US population in 2011–2014 and trends from 2003 to 2014. METHODS: We used serum 25-hydroxyvitamin D data from NHANES 2011–2014 (n = 16,180), and estimated the prevalence at risk of deficiency ( |