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Objective: Describe the situation of vitamin D deficiency in children aged 6 – 11 years at Vietnam National Children’s Hospital. Method: Cross-sectional study. Results: In 155 healthy children in the study, vitamin D deficiency (25(OH)D serum level < 50 nmol/l) was 23.9%. Common clinical symptoms of vitamin D deficiency were long bone pain (32%) and low ionized calcium level (83.8%). There was inverse linear correlation between vitamin D level, weight-for-age z score (WAZ) (r= –0.266 and p<0.01) and BMI-for-age z score (BAZ) (r= –0.241 and p<0.01). Conclusion: There was a high prevalence of vitamin D deficiency in healthy children aged 6-11 years (23.9%), the most common clinical symptoms of vitamin D deficiency were long bone pain and low serum level of ionized calcium, which have value in vitamin D deficiency diagnosis.

VITAMIN D DEFICIENCY IN CHILDREN AGED 6 – 11 AT VIETNAM NATIONAL CHILDREN’S HOSPITAL