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[Physiological proteinuria in the newborn].

T Statz, A Statz, K Felgenhauer

    Deutsche Medizinische Wochenschrift (1946)
    |January 11, 1985
    PubMed
    Summary
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    Urinary protein levels in children, including albumin and immunoglobulin G, are highest at birth and change significantly in the first three months. Renal function and protein clearance mature rapidly during early infancy.

    Area of Science:

    • Pediatric Nephrology
    • Clinical Chemistry
    • Biomarker Discovery

    Context:

    • Investigating protein excretion in pediatric populations is crucial for understanding renal development.
    • Laurell's electroimmunoassay provides a quantitative method for assessing specific protein levels in biological fluids.

    Purpose:

    • To quantify serum and urine levels of albumin, caeruloplasmin, immunoglobulin G, and alpha 2-macroglobulin in children aged 29 gestational weeks to 13 years.
    • To characterize the developmental changes in renal protein handling and filtration selectivity during early life.

    Summary:

    • Urinary excretion of albumin, caeruloplasmin, immunoglobulin G, and alpha 2-macroglobulin is highest in newborns, decreasing with age.
    • Serum/urine concentration ratios and protein clearances demonstrate significant maturation within the first three months of life.

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  • Gestational age did not influence initial urinary protein levels, but renal function and filtration selectivity develop rapidly postnatally.

    • Impact:

    • Establishes normative data for urinary protein excretion in infants and children.
    • Provides insights into the ontogeny of renal filtration and reabsorption processes.
    • Highlights the dynamic changes in renal protein handling during the critical early developmental period.