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A cross\u2010sectional study was conducted in healthy Thai physicians who had at least 1\u00a0years\u2019 experience in dermatology practise and a subsample of the general Thai population from the Fourth National Health Survey. Serum 25\u2010hydroxyvitamin D (25[<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>]D), a combination of 25(<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>)D2 and 25(<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>)D3, levels in both groups were measured using liquid chromatography coupled with mass spectrometry. The majority of dermatologists were of Fitzpatrick skin type <jats:styled-content style=\"fixed-case\">III<\/jats:styled-content> (<jats:italic>n<\/jats:italic>\u00a0=\u00a061, 61.3%) or <jats:styled-content style=\"fixed-case\">IV<\/jats:styled-content> (<jats:italic>n<\/jats:italic>\u00a0=\u00a032, 33.3%). The mean serum 25(<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>)D and 25(<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>)D3 levels were 18.9 and 18.2\u00a0ng\/mL, respectively, whereas the corresponding levels in the general population were 26.5 and 25.8\u00a0ng\/mL. None of the dermatologist had serum 25(<jats:styled-content style=\"fixed-case\">OH<\/jats:styled-content>)D sufficiency (&gt;30\u00a0ng\/mL), 38 (38.78%) had vitamin D insufficiency (20\u201330\u00a0ng\/mL) and 60 (61.22%) had vitamin D deficiency (&lt;20\u00a0ng\/mL). The frequency of vitamin D deficiency in dermatologists was significantly higher than in the general population (61.2% vs 19.2%, <jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.001). Ninety percent of dermatologists used sunscreen daily and spent time mostly indoors. Dermatologists used physical sun\u2010protection more than half of the time when outdoors, for example, a book or paper as a sunshade (70.3%), an umbrella (48.4%), a long\u2010sleeved shirt (20.4%) or a hat (9.7%). In conclusion, dermatologists showed a remarkably high prevalence of vitamin D deficiency which may be due to inadequate exposure to sunlight, regular use of sunscreen and practicing various sun\u2010protection activities.<\/jats:p>","DOI":"10.1111\/1346-8138.14742","type":"journal-article","created":{"date-parts":[[2018,12,28]],"date-time":"2018-12-28T09:40:25Z","timestamp":1545990025000},"page":"206-212","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Vitamin D status in Thai dermatologists and working\u2010age Thai population"],"prefix":"10.1111","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7674-0177","authenticated-orcid":false,"given":"Natta","family":"Rajatanavin","sequence":"first","affiliation":[{"name":"Division of Dermatology Department of Medicine Faculty of Medicine Ramathibodi Hospital Mahidol University Bangkok 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