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Serum creatine phosphokinase in normal newborns

N Gilboa, J R Swanson

    Archives of Disease in Childhood
    |April 1, 1976
    PubMed

    Insights

    Serum creatine phosphokinase (CPK) levels are significantly elevated in newborns compared to adults. These levels normalize within weeks, suggesting delayed screening for Duchenne-type muscular dystrophy.

    Area of Science:

    • Biochemistry
    • Neonatal Medicine
    • Pediatric Neurology

    Background:

    • Serum creatine phosphokinase (CPK) is an enzyme indicator of muscle damage.
    • Elevated CPK levels in newborns can complicate the diagnosis of neuromuscular disorders.

    Purpose of the Study:

    • To establish normal ranges of serum CPK activity in healthy newborns.
    • To determine the typical decline pattern of neonatal CPK levels.
    • To assess the impact of birth trauma on neonatal CPK activity.

    Main Methods:

    • Measured serum CPK activity in 70 normal newborns.
    • Compared neonatal CPK levels to adult and older child reference ranges.
    • Tracked CPK activity changes during the first 6-10 weeks of life.
    • Investigated correlation between birth trauma and CPK levels.

    Main Results:

    • Normal newborns exhibit significantly higher serum CPK activity (up to 10x adult levels).
    • CPK levels decrease to near-normal within 4 days and normalize by 6-10 weeks.
    • No significant correlation found between birth trauma and elevated CPK.
    • Cord blood CPK levels are lower than venous and capillary blood CPK.

    Conclusions:

    • Neonatal hyperCKemia is a normal physiological finding.
    • Routine newborn screening for Duchenne-type muscular dystrophy should be deferred for several weeks post-delivery.
    • Understanding normal CPK kinetics in neonates is crucial for accurate diagnosis of muscular dystrophies.

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