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Serum complement profiles in infants and children.

M E Norman, E P Gall, A Taylor

    The Journal of Pediatrics
    |December 1, 1975
    PubMed
    Summary
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    Pediatric complement component levels (C3, C4, C5, CH50) vary significantly with age but not sex or race. Establishing these normal pediatric values is crucial for diagnosing childhood diseases.

    Area of Science:

    • Immunology
    • Pediatric Medicine
    • Clinical Chemistry

    Background:

    • Complement system proteins (C3, C4, C5) and total hemolytic complement (CH50) activity are critical immune components.
    • Establishing age-specific normal ranges for these components in children is essential for accurate diagnosis and monitoring of diseases.

    Purpose of the Study:

    • To determine normal serum values for complement components C3, C4, C5, and CH50 activity in healthy children aged 0-14 years.
    • To identify age-related variations and establish reference ranges for pediatric complement levels.

    Main Methods:

    • Serum samples were collected from 163 healthy infants and children (birth to 14 years).
    • Levels of complement components C3, C4, C5, and CH50 activity were measured.
    • Statistical analyses were performed to assess relationships with age, sex, and race.

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    Main Results:

    • Statistically significant relationships were observed between age and C3, C4, and C5 levels, but not CH50.
    • No significant differences in complement levels were found based on sex or race.
    • Tolerance limits for high and low values were projected for 75%, 90%, and 95% of the population.

    Conclusions:

    • Complement component levels in children differ from adults and exhibit significant biological variability.
    • Normal pediatric reference ranges for C3, C4, C5, and CH50 are necessary for clinical laboratories assessing childhood diseases.
    • These findings highlight the importance of age-specific reference values in pediatric immunology.