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Related Experiment Videos

Urinary creatinine excretion in the newborn.

J Al-Dahhan1, L Stimmler, C Chantler

  • 1Evelina Children's Hospital (Guy's Hospital), London.

Archives of Disease in Childhood
|April 1, 1988
PubMed
Summary

Endogenous creatinine excretion in newborns is linked to weight and development. Factored by weight, this rate remains consistent, offering a valuable metric for infant health assessment.

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Area of Science:

  • Neonatal Physiology
  • Pediatric Nephrology
  • Biomarker Research

Background:

  • Creatinine is a metabolic byproduct reflecting muscle metabolism and kidney function.
  • Understanding creatinine excretion dynamics is crucial for assessing renal function in neonates.
  • Accurate reference ranges for creatinine excretion are needed for clinical interpretation in growing infants.

Purpose of the Study:

  • To quantify the endogenous creatinine excretion rate in a cohort of newborn infants.
  • To identify factors influencing creatinine excretion, including weight, height, and age.
  • To establish a weight-normalized creatinine excretion rate for term and preterm neonates.

Main Methods:

  • Analysis of 84 24-hour urine collections from 60 neonates (term and preterm).
  • Measurement of endogenous creatinine excretion rates.
  • Statistical correlation analysis with infant weight, height, and postconceptional age.

Main Results:

  • Creatinine excretion rate positively correlated with infant weight and height.
  • The strongest correlation was observed between excretion rate and body weight.
  • Weight-factored creatinine excretion rate was consistent across the studied range (median 90 µmol/kg/day).

Conclusions:

  • Endogenous creatinine excretion in neonates is primarily influenced by body weight.
  • A standardized, weight-normalized creatinine excretion rate provides a reliable reference range.
  • This finding aids in the assessment of renal function and growth in newborn infants.

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