Reference intervals of amino acid and acylcarnitine levels in full-term newborns. The effect of the timing of blood collection in newborns for extended neonatal screening
- Authors: Geraskin A.I.1,2, Shubina Y.F.3,4, Gaziev I.R.1, Potekhin O.E.1, Vitkovskaya I.P.3,5
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Affiliations:
- Morozov Children’s City Clinical Hospital
- Peoples' Friendship University of Russia
- Russian National Research Medical University named after N.I. Pirogov
- Laboratory Diagnostic Center
- Russian Research Institute of Health
- Issue: Vol 69, No 1 (2024)
- Pages: 41-51
- Section: Original Study Articles
- Published: 18.12.2024
- URL: https://kld-journal.fedlab.ru/0869-2084/article/view/635678
- DOI: https://doi.org/10.17816/cld635678
- ID: 635678
Cite item
Abstract
BACKGROUND: The timing of samples collection of blood for neonatal screening is a critical mean for the results accuracy. Changing the timing of samples of blood collection can affect the concentrations of amino acids and acylcarnitines, which requires clarifying the reference intervals to minimize false positive and false negative results.
AIM: To evaluate the effect of samples collection of blood time (on the 1 st –2 nd and 4 th –5 th days of life) on the concentrations of amino acids and acylcarnitines in dry blood spots of full-term newborns and verify the appropriate reference intervals for use in extended neonatal screening.
MATERIALS AND METHODS: A retrospective observational study was conducted, which included 83 087 newborn blood samples collected at the Morozov Children’s City Clinical Hospital in 2022–2023. Concentrations of 11 amino acids, 31 acylcarnitine and succinylacetone were determined by tandem mass spectrometry. Nonparametric methods with a significance level of p <0.05 were used to calculate the reference intervals and analyze the differences between the groups.
RESULTS: The analysis showed significant differences in concentrations for all 43 analytes between the groups (Day 1–2, n =61,996; Day 4–5, n =21,091). Concentrations of many amino acids were higher at later sampling periods, while methionine levels decreased. 99% reference intervals have been established for all analytes, which allows the threshold values to be adapted depending on the time of samples collection of blood.
CONCLUSION: The obtained data emphasize the need to adjust the reference intervals for amino acids and acylcarnitines depending on the timing of blood collection. This will ensure a more accurate diagnosis of hereditary diseases in newborns and increase the effectiveness of neonatal screening.
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About the authors
Aleksei I. Geraskin
Morozov Children’s City Clinical Hospital; Peoples' Friendship University of Russia
Email: alexey-geraskin@mail.ru
ORCID iD: 0000-0003-1589-4564
SPIN-code: 8727-3045
Russian Federation, Moscow; Moscow
Yulia F. Shubina
Russian National Research Medical University named after N.I. Pirogov; Laboratory Diagnostic Center
Email: shubinaj@mail.ru
ORCID iD: 0000-0001-8661-3817
SPIN-code: 8887-6854
MD, Cand. Sci. (Medicine)
Ivan R. Gaziev
Morozov Children’s City Clinical Hospital
Email: igaziev@morozdgkb.ru
ORCID iD: 0009-0006-8751-0434
SPIN-code: 6326-4337
Russian Federation, Moscow
Oleg E. Potekhin
Morozov Children’s City Clinical Hospital
Email: potehino@yandex.ru
ORCID iD: 0000-0001-6399-3247
SPIN-code: 1810-0370
Irina P. Vitkovskaya
Russian National Research Medical University named after N.I. Pirogov; Russian Research Institute of Health
Author for correspondence.
Email: vip-dzm@mail.ru
ORCID iD: 0000-0002-0740-1558
SPIN-code: 2970-0361
MD, Cand. Sci. (Medicine)
Russian Federation, Moscow; MoscowReferences
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