Dilek GOGAS YAVUZReyhan ERSOYYüksel ALTUNTAŞHabip BİLENBarış PAMUKEren İMRESule TEMİZKANHasan ALTUNTAŞMeral MERTAysen AKALINMurat SERTIlgın YILDIRIM ŞİMŞİRZeliha HEKİMSOYZeynep CANTÜRKZiynet ALPHAN ÜÇSüleyman İPLİKÇİMehmet YAŞARMustafa ÜNÜBOLKerem SEZERÖmercan TOPALOĞLUÖzlem İYİDİRZafer PEKKOLAYAyşegül ATMACAOğuz DİKBAŞNilüfer ÖZDEMİRKamile GÜLFerhat DENİZEda ERTÖERZüleyha KARACAGülşah ELBÜKENDilek ARPACIKemal AGBAHTElif TURANİnan ANAFOROĞLUTaner BAYRAKTAROĞLUGoncagül HAKLARGülçin DAĞLIOĞLUAlpaslan Kemal TUZCUİbrahim ŞAHİNŞevki ÇETİNALP2024-07-242024-07-2420221301-2193http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/21472Objective: Vitamin D deficiency is a common health problem around the world. This study aimed to evaluate the nationwide prevalence of vitamin D status in tertiary care hospitals in Turkey. Methods: Retrospectively, the data on vitamin D levels from 33 tertiary care hospitals’ clinical biochemistry laboratories around Turkey between January and December were collected. Results: In total, 706 434 serum samples from adult subjects (female/male: 469 028/237 406; 66.4%/33.6%) were included. While vitamin D levels were sufficient in 20.3% (n = 14 222), they were insufficient in 21.9% (n = 154 360) and deficient in 57.8% (n = 408 882). We observed the highest rates of deficiency in those aged between 18 and 29 years (62.9%, n = 70 235) and lowest rates between 60 and 69 years (52.3%, n = 61 121) and between 70 and 79 years (52.3%, n = 32 397). Hypervitaminosis D was detected in 5.5% of adult subjects; highest rates of hypervitaminosis D were observed in those who were over 80 years (6.6%) and 70-79 years (6.5%) and the lowest in 18-29 years (2.8%). Discussion: In this cohort, over half of the subjects admitted to the tertiary care hospitals in Turkey had vitamin D deficiency and required vitamin D supplementation. The elderly population had the lowest prevalence of vitamin D insufficiency and the highest prevalence of hypervitaminosis D.engAraştırma Makalesi10.5152/tjem.2022.22031