The vitamin D status of the US population from 1988 to 2010 using standardized serum concentrations of 25-hydroxyvitamin D shows recent modest increases(1)(2)(3)

Eitemau Tebyg

• National Estimates of Serum Total 25-Hydroxyvitamin D and Metabolite Concentrations Measured by Liquid Chromatography–Tandem Mass Spectrometry in the US Population during 2007–2010(1)(2)(3)(4)
  gan: Schleicher, Rosemary L, et al.
  Cyhoeddwyd: (2016)
• Serum 25-hydroxyvitamin D status of the US population: 1988–1994 versus 2000–2004
  gan: Looker, Anne C., et al.
  Cyhoeddwyd: (2008)
• Quality specifications and their daily application to evaluate the accuracy of reference measurements for serum concentrations of 25-hydroxyvitamin D(3) and 25-hydroxyvitamin D(2)
  gan: Mineva, Ekaterina M., et al.
  Cyhoeddwyd: (2018)
• A Candidate Reference Measurement Procedure for Quantifying Serum Concentrations of 25-Hydroxyvitamin D(3) and 25-Hydroxyvitamin D(2) Using Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry
  gan: Mineva, Ekaterina M., et al.
  Cyhoeddwyd: (2015)
• Changes in Measurement Procedure from a Radioassay to a Microbiologic Assay Necessitate Adjustment of Serum and RBC Folate Concentrations in the U.S. Population from the NHANES 1988–2010(2)
  gan: Pfeiffer, Christine M., et al.
  Cyhoeddwyd: (2012)