Conclusion:
The overall prevalence of vitamin D deficiency in hospital admitted
subjects is similar to those in hospital-derived studies from national
Turkish and European populations. In this cohort, over half of the
subjects admitted to the general hospitals in Turkey had vitamin D
deficiency requiring vitamin D supplementation. Although this
retrospective study was not able to exclude vitamin D-related diseases
and vitamin D-treated patients, the highest prevalence of
hypervitaminosis D is observed in the elderly population that may
indicate overtreatment vitamin D supplementation in the tertiary care
hospitals in Turkey. Further prospective studies are needed to guide
appropriate vitamin D supplementation for subgroups and to prevent
overtreatment.