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Related Experiment Videos

Fetal steroid levels at delivery

S Roopnarinesingh, D Alexis, R Lendore

    Obstetrics and Gynecology
    |October 1, 1977
    PubMed
    Summary

    Neonatal cortisol levels did not differ significantly based on maternal parity, infant sex, or pregnancy type. Fetal cortisol did not change with gestational age after 33 weeks, suggesting a potential role in initiating labor.

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    Area of Science:

    • Endocrinology
    • Neonatal Physiology
    • Obstetrics

    Background:

    • Cortisol, a key stress hormone, plays a crucial role in physiological processes.
    • Understanding fetal endocrine responses during labor is vital for neonatal health.
    • Spontaneous labor onset involves complex hormonal signaling between mother and fetus.

    Purpose of the Study:

    • To investigate fetal circulation cortisol levels in neonates at spontaneous labor onset.
    • To determine if cortisol levels correlate with maternal parity, infant sex, or pregnancy complications.
    • To examine the relationship between fetal cortisol and gestational age.

    Main Methods:

    • Cord blood samples were collected from neonates immediately after birth.
    • Cortisol concentrations in cord plasma were measured using established assays.
    • Data were analyzed to identify significant differences based on demographic and clinical factors.

    Main Results:

    • No significant differences in cord plasma cortisol were observed between primigravidas and multigravidas.
    • Cortisol levels showed no significant variation between male and female neonates.
    • Fetal cortisol concentrations did not change significantly with advancing gestational age beyond 33 weeks.
    • No significant differences were found in relation to normal versus preeclamptic pregnancies.

    Conclusions:

    • Spontaneous human labor may be preceded by increased fetal cortisol release.
    • A critical threshold of fetal cortisol may trigger the onset of parturition.
    • Fetal cortisol levels appear independent of maternal parity, infant sex, and preeclamptic status after 33 weeks gestation.

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