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Reference values for urinary calcium and phosphorus to prevent osteopenia of prematurity

F Pohlandt, W A Mihatsch

    Pediatric Nephrology (Berlin, Germany)
    |September 7, 2004
    PubMed

    Insights

    Preventing osteopenia of prematurity in preterm infants is crucial. New research explores urinary calcium/creatinine and phosphorus/creatinine ratios as potential markers for bone health, but further validation is needed.

    Area of Science:

    • Neonatal Medicine
    • Pediatric Endocrinology
    • Biochemistry

    Background:

    • Osteopenia of prematurity is a significant concern in preterm infant care.
    • Current management involves achieving slight surplus supply (SSS) of calcium (Ca) and phosphorus (P) to promote fetal bone mineral accretion.
    • Optimal urinary Ca and P concentrations are targeted at 1-2 mmol/l.

    Discussion:

    • Aladangady et al. investigate associations between urinary Ca/Cr and PO(4)/Cr ratios and bone metabolism in preterm infants.
    • The reliability of these ratios as substitutes for direct bone mineral content (BMC) measurement remains unproven.
    • Establishing these ratios as a new reference for improving BMC requires further rigorous investigation.

    Key Insights:

    • Urinary Ca/Cr and PO(4)/Cr ratios are proposed as potential indicators for monitoring bone mineral metabolism in preterm infants.
    • Direct measurement of bone mineral content (BMC) is currently the gold standard.
    • The study highlights the need to validate novel biochemical markers against established methods.

    Outlook:

    • Future research should include direct BMC measurement to validate the proposed urinary ratios.
    • Prospective interventional trials are necessary to compare the efficacy of these new ratios against existing SSS protocols.
    • Demonstrating the superiority of Ca/Cr and PO(4)/Cr ratios over simple urinary Ca and P concentrations is essential for clinical adoption.

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