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Objective: To study the prevalence of suboptimal vitamin D level (vitamin D insufficiency and vitamin D deficiency) and mean blood level of 25-hydroxy vitamin D in different patient groups at Chulabhorn Hospital.
Materials and Methods: The present study was a retrospective descriptive study. Data of all patients who visited Chulabhorn Hospital and were tested for serum 25-hydroxy vitamin D level between August 1st, 2016 and September 31st, 2018 were collected from the computer database. The primary outcome was the prevalence of suboptimal vitamin D level at Chulabhorn Hospital. The secondary outcome was the prevalence of suboptimal vitamin D level and mean serum level of 25-hydroxy vitamin D in different patient groups.
Results: Data from 1,211 patients were obtained from the database. The prevalence of suboptimal vitamin D level was 71.4%. The mean serum 25-hydroxy vitamin D (25(OH)D) level was 25.6 ng/ml. The mean serum 25(OH)D level was higher in the outpatient department group than the intensive care unit and inpatient department group with statistical significance and practical significance (p<0.001, effect size 0.58).
Conclusion: Suboptimal level of vitamin D was common at Chulabhorn Hospital.
Keywords: Vitamin D deficiency, Vitamin D insufficiency, Suboptimal vitamin D level, Chulabhorn Hospital, Thailand