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Weight as the best standard for glomerular filtration in the newborn

M G Coulthard, E N Hey

    Archives of Disease in Childhood
    |April 1, 1984
    PubMed

    Insights

    Glomerular filtration rate indexed to body weight is a more reliable measure of infant kidney function than indexing to body surface area. This finding offers a practical index for neonatal renal assessment.

    Area of Science:

    • Neonatology
    • Pediatric Nephrology
    • Physiology

    Background:

    • Infant body size changes dynamically, impacting physiological measurements.
    • Standard methods for indexing renal function may not accurately reflect changes in neonates.

    Purpose of the Study:

    • To evaluate the most effective method for indexing glomerular filtration rate in neonates.
    • To determine the practical utility of different indexing methods for assessing renal function in infants.

    Main Methods:

    • Studied 31 healthy infants (27-40 weeks' gestation).
    • Compared glomerular filtration rate indexed to body weight (GFR/kg) versus body surface area (GFR/m²).

    Main Results:

    • Indexing glomerular filtration rate to body weight reduced variability more than twofold compared to indexing to body surface area.
    • GFR/kg demonstrated significantly less variation in healthy neonates.

    Conclusions:

    • Glomerular filtration rate indexed to body weight is a superior and more practical index for assessing renal function in neonates.
    • This method offers improved accuracy for evaluating kidney function during the neonatal period.

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