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Introduction:We aimed to evaluate the interchangeability of sodium, potassium, hemoglobin, and hematocrit measurement between the blood gas analyzers and laboratory automatic analyzers results.Methods: This was a retrospective cross-sectional study. The results of 1927 paired samples analyzed simultaneously with the blood gas analyzer and the laboratory automatic analyzer were compared. The Bland-Altman and Cohen's kappa statistic detected the agreement between the two analyses. Results:The limits of agreement (±1.96 standard deviation of the mean difference) were −11.1 to 20.3 for sodium, −1.9 to 0.5 for potassium, −16.1 to 12.9 for hematocrit, and −5.0 to 4.0 for hemoglobin. Agreement between the two analyses was not acceptable within the defined clinically acceptable limits. In addition, none of the kappa values were higher than 0.60, which highlights the lack of agreement between the two analyzers. Conclusion:The blood gas analyzers and laboratory automatic analyzers results cannot be used interchangeably.

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Introduction: This study aims to determine the frequency of vitamin D deficiency according to gender and age groups in children admitted to our hospital. Methods: A cross-sectional study was conducted in the pediatric clinic of a tertiary care hospital in Ankara. Healthy children whose 25-hydroxyvitamin D levels were measured for any reason from January 2015 to January 2020 were included in the study. The vitamin D levels of the participants were analyzed according to age, gender, and measuring season. Children were divided into 4 subgroups according to their age: infancy (0-1 years), preschool (2-5 years), school (6-11 years), and adolescence (12-18 years). Vitamin D deficiency was defined as serum 25-hydroxyvitamin D concentrations ≤20 ng/ml. Results: A total of 16321 children were included in the study. The participants detected Vitamin D deficiency in 10777 (66%). The deficiency was mostly detected during adolescence (n: 6718, 51%). This was followed by the school period (31.3%), preschool period (15.1%), and infancy (2.7%), respectively. The deficiency was mostly detected during the winter months. While vitamin D deficiency was more common in women over the age of six, no difference was found between the sexes under the age of six. Conclusions: In this study, the prevalence of vitamin D deficiency in children was found to be high. Due to its role in many physiological events, urgent measures should be taken for the prevention, recognition, and treatment of vitamin D deficiency in children.