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Related Experiment Videos

Reference range for serum cortisol in well preterm infants.

M Heckmann1, S A Wudy, D Haack

  • 1Division of Neonatology and Paediatric Critical Care, Department of Paediatrics, University of Ulm, Germany.

Archives of Disease in Childhood. Fetal and Neonatal Edition
|October 19, 1999
PubMed
Summary

This study establishes a reference range for serum cortisol in preterm infants born before 30 weeks gestation. Findings provide crucial data for assessing adrenal function in this vulnerable population.

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Area of Science:

  • Neonatal Medicine
  • Endocrinology
  • Pediatric Physiology

Background:

  • Preterm infants, especially those born before 30 weeks gestation, often experience endocrine dysregulation.
  • Establishing normative data for serum cortisol is essential for clinical management and understanding adrenal function in neonates.

Purpose of the Study:

  • To determine a precise reference range for serum cortisol concentrations in preterm infants (gestational age < 30 weeks) within the first two weeks of life.
  • To investigate the relationship between gestational age, birth weight, and serum cortisol levels in this population.

Main Methods:

  • Prospective study excluding infants with specific medical conditions or interventions that could affect cortisol levels.
  • Serum cortisol was measured once using radioimmunoassay in eligible preterm infants.

Related Experiment Videos

  • Statistical analysis, including logarithmic transformation, was used to establish the reference range and assess associations.

    • Main Results:

    • A reference range of 73-562 nmol/l was established for appropriate for gestational age (AGA) preterm infants (n=37).
    • Gestational age showed a significant association with serum cortisol levels (p=0.033).
    • Small for gestational age (SGA) infants (n=8) exhibited significantly higher median cortisol levels (357 nmol/l) compared to AGA infants (199 nmol/l) (p=0.028).

    Conclusions:

    • A well-defined reference range for serum cortisol concentrations in AGA preterm infants has been established.
    • These findings are critical for accurate interpretation of cortisol levels and clinical decision-making in extremely preterm neonates.
    • The study highlights the influence of gestational age and growth status on neonatal cortisol levels.