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Renal uric acid clearance in human neonates

F B Stapleton

    The Journal of Pediatrics
    |August 1, 1983
    PubMed

    Insights

    Infant uric acid clearance improves with gestational age, with fractional excretion of uric acid decreasing significantly. This developmental change in renal handling of uric acid may impact infant kidney health.

    Area of Science:

    • Neonatal physiology
    • Pediatric nephrology
    • Uric acid metabolism

    Background:

    • Uric acid homeostasis is critical in neonates.
    • Renal handling of uric acid in premature and term infants is not fully understood.
    • Gestational age significantly influences neonatal kidney function.

    Purpose of the Study:

    • To investigate the renal clearance of uric acid in premature and term infants within the first 24 hours of life.
    • To determine the relationship between gestational age and uric acid excretion.
    • To explore the implications of uric acid handling for neonatal kidney health.

    Main Methods:

    • Studied renal clearance of uric acid in 40 infants (premature and term) within 24 hours of birth.
    • Measured creatinine clearance and uric acid clearance in relation to gestational age.
    • Assessed fractional excretion of uric acid (FEUA) and its correlation with gestational age and postnatal development.

    Main Results:

    • Uric acid clearance and creatinine clearance increased with gestational age.
    • Serum uric acid concentration and FEUA were inversely related to gestational age.
    • FEUA decreased from approximately 70% in very premature infants to 39% in term infants, indicating altered tubular transport.
    • FEUA also declined during early postnatal development in premature infants.

    Conclusions:

    • Renal uric acid excretion undergoes significant maturation during late gestation and early postnatal life.
    • The observed decline in FEUA with advancing gestational age is linked to changes in renal tubular transport of uric acid.
    • High basal uric acid excretion in neonates may pose a risk for acute uric acid nephropathy under conditions of increased excretion demands.

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