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Renal function in full-term neonates with hyperbilirubinemia

Y Haimi-Cohen1, P Merlob, M Davidovitz

  • 1Nephrology Unit, Children's Medical Center of Israel, Israel.

Journal of Perinatology : Official Journal of the California Perinatal Association
|May 1, 1997
PubMed
Summary

Unconjugated hyperbilirubinemia in healthy newborns does not impair kidney function. This study found no significant differences in renal parameters between infants with and without jaundice, indicating no need for altered management.

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Area of Science:

  • Neonatology
  • Pediatric Nephrology
  • Biochemistry

Background:

  • Neonatal hyperbilirubinemia is common in newborns.
  • Concerns exist regarding its potential impact on immature renal function.
  • Understanding renal effects is crucial for appropriate infant care.

Purpose of the Study:

  • To evaluate the effect of unconjugated hyperbilirubinemia on kidney function in full-term infants.
  • To assess endogenous creatinine clearance and urinary excretion of key substances.
  • To determine if jaundice necessitates changes in managing renal function.

Main Methods:

  • Studied 37 healthy, breast-fed, full-term newborns (3-5 days old).
  • Compared 20 infants with hyperbilirubinemia (mean indirect bilirubin 16.4 mg/dl) to 17 controls (mean indirect bilirubin 7.8 mg/dl).

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  • Measured urine and serum creatinine, sodium, phosphorus, lysozyme, glucose, and amino acids; calculated creatinine clearance, fractional excretion of sodium (FENa), and tubular reabsorption of phosphate (TP/GFR).

    • Main Results:

    • No statistically significant differences were observed in creatinine clearance between hyperbilirubinemic and control groups.
    • Fractional excretion of sodium (FENa) and tubular reabsorption of phosphate (TP/GFR) also showed no significant variations.
    • All measured renal function parameters remained comparable between the two groups.

    Conclusions:

    • Neonatal hyperbilirubinemia, with indirect bilirubin levels below 20.8 mg/dl, does not adversely affect the renal function of healthy, full-term newborns.
    • Current management approaches for renal function in these infants do not require modification due to mild hyperbilirubinemia.
    • This finding supports the safety of current practices for managing common neonatal jaundice.