Hasan ALTUNTAŞHabip BİLENzafer pekkolayŞevki ÇETİNALPKerem SezerZİYNET ALPHAN ÜÇTANER BAYRAKTAROĞLUAYSEN AKALINKemal AğbahtÖzlem Turhan İyidirmustafa ünübolSule Temizkantugce apaydinAYSEGUL ATMACANilufer OzdemirYüksel Altuntaşİbrahim ŞahinALPASLAN KEMAL TUZCUMEHMET YAŞARzeynep canturkGÜLÇİN DAĞLIOĞLUZuleyha karacaÖmercan TopaloğluReyhan Ersoyoğuz dikbaşIlgın YILDIRIM ŞİMŞİRBarış PAMUKSüleyman İPLİKÇİelif turanZeliha HekimsoyMurat SertDilek Gogas YavuzGoncagul HaklarDilek ARPACIİnan ANAFOROĞLUMeral MertGulsah Elbukenkamile gülEda ERTÖERFERRAT DENIZ2025-04-142025-04-142022http://hdl.handle.net/20.500.14701/55347Objective: Vitamin D deficiency is a common health problem around the world. This study aimed to\revaluate the nationwide prevalence of vitamin D status in tertiary care hospitals in Turkey.\rMethods: Retrospectively, the data on vitamin D levels from 33 tertiary care hospitals’ clinical biochemistry\rlaboratories around Turkey between January and December were collected.\rResults: In total, 706 434 serum samples from adult subjects (female/male: 469 028/237 406;\r66.4%/33.6%) were included. While vitamin D levels were sufficient in 20.3% (n = 14 222), they were\rinsufficient in 21.9% (n = 154 360) and deficient in 57.8% (n = 408 882).\rWe observed the highest rates of deficiency in those aged between 18 and 29 years (62.9%, n = 70\r235) and lowest rates between 60 and 69 years (52.3%, n = 61 121) and between 70 and 79 years\r(52.3%, n = 32 397). Hypervitaminosis D was detected in 5.5% of adult subjects; highest rates of\rhypervitaminosis D were observed in those who were over 80 years (6.6%) and 70-79 years (6.5%)\rand the lowest in 18-29 years (2.8%).\rDiscussion: In this cohort, over half of the subjects admitted to the tertiary care hospitals in Turkey\rhad vitamin D deficiency and required vitamin D supplementation. The elderly population had the\rlowest prevalence of vitamin D insufficiency and the highest prevalence of hypervitaminosis D.İngilizceEndokrinoloji ve Metabolizma10.5152/tjem.2022.22031