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Reference serum creatinine levels according to sex, age, and height in children with Down syndrome

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Abstract

Standard serum creatinine (S–Cr) levels in healthy children fluctuate with age and sex. However, it is unclear if this fluctuation in S–Cr levels is present for children with Down syndrome (DS) who show atypical growth rate. Therefore, we aimed to establish specific reference S–Cr levels for DS and compare them with the prevailing standard levels. We retrospectively reviewed 984 children with DS aged 3 months to 18 years who visited our medical center. Patients with diseases affecting S–Cr levels were excluded. We calculated the reference S–Cr levels according to sex, age, and length/height using medical records. A total of 3765 examinations of 568 children with DS were registered for this study. Ages and S–Cr levels were examined for boys (y = 0.032x + 0.20; r = 0.868, P < 0.0001), and girls (y = 0.024x + 0.23; r = 0.835, P < 0.0001). S–Cr levels in children aged >9 years were significantly higher in boys than in girls. The 430 children with DS aged 2–8 years were examined 1867 times. Height and S–Cr levels showed a significantly strong positive correlation (r = 0.670, P < 0.001) with regression equation y = 0.37x. The quintic equations calculated with S–Cr levels and length/height for boys (336 children, 2043 tests, r = 0.887) and girls (232 children, 1722 tests, r = 0.805) werey =  − 6.132x5 + 32.78x4 − 67.86x3 + 68.31x2 − 33.14x + 6.41, and y = 0.09542x5 + 1.295x4 − 6.401x3 + 10.35x2 − 6.746x + 1.772. All calculated results varied from the standard levels for healthy children.

Conclusion: This study established reference S–Cr levels and quintic equations specific for children with DS. These reference levels would be potentially useful in evaluating S–Cr levels and renal function in this population.

What is Known:

•Standard serum creatinine levels vary with age and sex to reflect muscle mass.

•Reference serum creatinine levels specific to children with Down syndrome who show growth rates different from those of healthy children have not been established.

What is New:

•Serum creatinine levels in children with Down syndrome showed different trajectories for sex, age, and length/height when compared with the standard levels for healthy children.

•This report on specific reference serum creatinine levels for children with Down syndrome is useful in the assessment of renal function in these children.

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Availability of data and material

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code availability

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Abbreviations

ASD:

Atrial septal defect

AVSD:

Atrioventricular septal defect

CAKUT:

Congenital anomalies of the kidney and urinary tract

CGN:

Chronic glomerulonephritis

CHD:

Congenital heart disease

DORV:

Double-outlet right ventricle

DS:

Down syndrome

MAE:

Mean absolute error

ME:

Mean error

PDA:

Patent ductus arteriosus

PFO:

Patent foramen ovale

RMSE:

Root mean square error

S–Cr:

Serum creatinine

TOF:

Tetralogy of Fallot

VSD:

Ventricular septal defect

VUR:

Vesicoureteral reflux

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Acknowledgements

We would like to thank Dr. Uemura for his kind advice.

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There is no funding source.

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Authors and Affiliations

Authors

Contributions

Tomohiko Nishino mainly drafted the manuscript and performed the statistical analysis; Tomohiko Nishino, Shota Endo, Hiroki Miyano, Yoichi Takemasa, Masahito Saito, Chisato Umeda, and Yuji Tomii contributed to the conception and design of this study; Yoshitaka Watanabe, Mayu Nakagawa, and Daisuke Kakegawa critically reviewed the manuscript; Shuichiro Fujinaga supervised the whole study process. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Tomohiko Nishino.

Ethics declarations

Ethics approval and consent to participate

The study was approved by the local ethics committee for human research (protocol number 2020-04-025). All procedures involving human participants were conducted according to the ethical standards of the institutional and/or national research committee and within the guidelines of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The requirement for informed consent was waived by the institutional review board due to the retrospective nature of the study.

Consent for publication

In consideration of human rights and ethics, this research was conducted under the review of the ethics committee of the medical center, and the study plan outline was presented on our center’s website, where patients and parents could ask questions about the study and opt-out from the use of their data.

Conflict of interest

The authors declare no competing interests.

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Communicated by Gregorio Paolo Milani

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Nishino, T., Endo, S., Miyano, H. et al. Reference serum creatinine levels according to sex, age, and height in children with Down syndrome. Eur J Pediatr 180, 2977–2983 (2021). https://doi.org/10.1007/s00431-021-04078-z

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