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Related Experiment Videos

Why do newborn infants have a high plasma creatinine?

J P Guignard1, A Drukker

  • 1Division of Pediatric Nephrology, Department of Pediatrics, Lausanne University Medical Center, Lausanne, Switzerland.

Pediatrics
|April 2, 1999
PubMed
Summary

Newborns have elevated plasma creatinine (Pcr) due to immature kidney function, specifically tubular reabsorption. This temporary phenomenon resolves as infant kidneys mature, normalizing Pcr levels.

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Area of Science:

  • Neonatal Physiology
  • Renal Function in Infants
  • Biochemistry

Background:

  • Plasma creatinine (Pcr) levels are notably high in newborns, especially preterm infants, persisting for weeks.
  • These elevated Pcr levels cannot be explained by maternal transfer or immature glomerular filtration alone.
  • The elevated Pcr suggests an unusual renal handling of creatinine in neonates.

Observation:

  • Maternal and fetal Pcr levels equilibrate during gestation.
  • Newborn Pcr remains high post-birth, inversely correlating with birth weight.
  • Newborn rabbits exhibit reduced creatinine clearance (Ccr) relative to inulin clearance (Cin), unlike adults.

Findings:

  • Newborn infants reabsorb creatinine along the renal tubule.
  • This tubular reabsorption is hypothesized to result from immature, leaky renal structures.
  • Elevated Pcr levels in newborns are linked to temporary tubular creatinine reabsorption.

Implications:

  • Understanding neonatal renal handling of creatinine is crucial for interpreting Pcr values.
  • Immature tubular function contributes significantly to high Pcr in newborns.
  • Renal maturation gradually resolves high Pcr by improving tubular function and reducing reabsorption.

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