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Neonatal thyroid function: influence of perinatal factors.

R C Franklin, L M Carpenter, C M O'Grady

    Archives of Disease in Childhood
    |February 1, 1985
    PubMed
    Summary
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    Neonatal thyroid function tests, including thyroxine, are influenced by birthweight and delivery method. However, thyroid stimulating hormone screening for congenital hypothyroidism in healthy newborns is unaffected by these factors.

    Area of Science:

    • Neonatal endocrinology
    • Perinatal medicine
    • Thyroid function assessment

    Background:

    • Thyroid hormones are crucial for neonatal development.
    • Understanding factors influencing neonatal thyroid function is important for accurate assessment.
    • Congenital hypothyroidism screening is vital for early intervention.

    Purpose of the Study:

    • To investigate the impact of various perinatal factors on neonatal thyroid function indices.
    • To determine if factors like maternal health, delivery method, and infant characteristics affect thyroid hormone levels.
    • To evaluate the reliability of thyroid stimulating hormone (TSH) as a screening tool in healthy term neonates.

    Main Methods:

    • Measurement of thyroid function indices (thyroxine, free thyroxine index, free thyroxine, triiodothyronine, reverse triiodothyronine, thyroxine binding globulin, TSH) in 229 healthy term neonates.

    Related Experiment Videos

  • Analysis of data considering maternal diabetes, toxaemia, fetal distress, labor duration, delivery method, birth asphyxia, race, sex, birthweight, length, head circumference, and feeding method.
  • Statistical correlation and comparison of thyroid hormone levels based on perinatal factors.

    • Main Results:

    • Neonatal thyroxine, free thyroxine index, and free thyroxine concentrations at birth correlated with birthweight.
    • Method of delivery significantly influenced mean thyroxine and free thyroxine index values at birth and at 5 days of age.
    • Mean values for triiodothyronine, reverse triiodothyronine, thyroxine binding globulin, and TSH were not affected by the studied perinatal factors.

    Conclusions:

    • Birthweight and delivery method require consideration when interpreting neonatal thyroxine parameters.
    • Thyroid stimulating hormone (TSH) determination remains a reliable screening method for congenital hypothyroidism in healthy term neonates, irrespective of perinatal factors.
    • TSH screening effectively circumvents the complexities introduced by birthweight and delivery method variations.