Comparison of serum 25-hydroxyvitamin D levels between radioimmunoassay and liquid chromatography-tandem mass spectrometry in infants and postpartum women
Abstract
Background
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) has become the gold standard for the measurement of serum 25-hydroxyvitamin D (25(OH)D) levels instead of the conventional method, radioimmunoassay (RIA). However, there was no study that compared RIA and LC-MS/MS for measuring serum 25(OH)D levels in infants and their mothers. The aim of this study was to assess the agreement of RIA and LC-MS/MS for measuring the serum levels in infants and postpartum women.
Methods
This study enrolled 70 preterm infants, 113 term infants (134 samples), and 120 postpartum women. Serum concentration of 25(OH)D was measured by RIA and LC-MS/MS. We evaluated the correlation between RIA and LC-MS/MS. Also, we evaluated the bias between RIA and LC-MS/MS using Bland-Altman analysis.
Results
Sixty percent of preterm infants had serum 25(OH)D levels below the lower limit of quantification (LOQ) (4 ng/mL) and 90% of them were classified as vitamin D deficient. The serum 25(OH)D levels measured by RIA were significantly correlated with those measured by LC-MS/MS in all groups. According to the Bland-Altman plot, the serum 25(OH)D levels of infants measured by RIA had constant positive bias (mean±standard deviation [SD] [95% confidence interval, CI], preterm: +4.8± 2.4 ng/mL [4.2–5.4], term: +5.8±4.0 [5.1–6.5]) and proportional bias (preterm: r=0.44, p<0.01, term: r=0.50, p<0.01) compared with LC-MS/MS. The serum 25(OH)D levels of postpartum women measured by RIA had constant positive bias compared with LC-MS/MS, but no proportional bias was found.
Conclusions
RIA demonstrated falsely high 25(OH)D levels when used for infants and postpartum women.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None to declared.
Employment of readership: None declared.
Honorarium: None declared.
Competing interests: None declared.
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Articles in the same Issue
- Frontmatter
- Original Articles
- The associations between mental health, health-related quality of life and insulin pump therapy among children and adolescents with type 1 diabetes
- Achieving target levels for vascular risk parameters in Polish school-age children with type 1 diabetes – a single center study
- Adipocyte aquaporin 7 (AQP7) expression in lean children and children with obesity. Possible involvement in molecular mechanisms of childhood obesity
- Use of complementary and alternative medicine in patients with inherited metabolic disease
- Are breast milk adipokines affected by maternal dietary factors?
- Comparison of serum 25-hydroxyvitamin D levels between radioimmunoassay and liquid chromatography-tandem mass spectrometry in infants and postpartum women
- Reference intervals for neonatal thyroid function tests in the first 7 days of life
- Treatment outcomes in pediatric differentiated thyroid carcinoma
- Seasonality of month of birth in children and adolescents with autoimmune thyroiditis: a continuing conundrum
- Follow-up in children with non-obese and non-autoimmune subclinical hypothyroidism
- Glucose intolerance in children with cystic fibrosis: a developing country’s perspective
- Letter to the Editor
- A patient with classical galactosemia is graduated with a university degree
- Case Reports
- Prepubertal gynaecomastia in a boy with Peutz-Jeghers syndrome: managing the aromatase overexpression
- Hypogammaglobulinemia and imaging features in a patient with infantile free sialic acid storage disease (ISSD) and a novel mutation in the SLC17A5 gene
- Xanthogranuloma of the sellar region accompanied by growth hormone deficiency: case report and literature review
- A case of Graves’ disease associated with membranoproliferative glomerulonephritis and leukocytoclastic vasculitis
Articles in the same Issue
- Frontmatter
- Original Articles
- The associations between mental health, health-related quality of life and insulin pump therapy among children and adolescents with type 1 diabetes
- Achieving target levels for vascular risk parameters in Polish school-age children with type 1 diabetes – a single center study
- Adipocyte aquaporin 7 (AQP7) expression in lean children and children with obesity. Possible involvement in molecular mechanisms of childhood obesity
- Use of complementary and alternative medicine in patients with inherited metabolic disease
- Are breast milk adipokines affected by maternal dietary factors?
- Comparison of serum 25-hydroxyvitamin D levels between radioimmunoassay and liquid chromatography-tandem mass spectrometry in infants and postpartum women
- Reference intervals for neonatal thyroid function tests in the first 7 days of life
- Treatment outcomes in pediatric differentiated thyroid carcinoma
- Seasonality of month of birth in children and adolescents with autoimmune thyroiditis: a continuing conundrum
- Follow-up in children with non-obese and non-autoimmune subclinical hypothyroidism
- Glucose intolerance in children with cystic fibrosis: a developing country’s perspective
- Letter to the Editor
- A patient with classical galactosemia is graduated with a university degree
- Case Reports
- Prepubertal gynaecomastia in a boy with Peutz-Jeghers syndrome: managing the aromatase overexpression
- Hypogammaglobulinemia and imaging features in a patient with infantile free sialic acid storage disease (ISSD) and a novel mutation in the SLC17A5 gene
- Xanthogranuloma of the sellar region accompanied by growth hormone deficiency: case report and literature review
- A case of Graves’ disease associated with membranoproliferative glomerulonephritis and leukocytoclastic vasculitis