[Sequential changes of serum steroid levels in puerperium]

Area of Science:

• Endocrinology
• Reproductive Biology
• Maternal-Fetal Medicine

Context:

• The postpartum period is characterized by significant hormonal shifts.
• Understanding these changes is vital for assessing maternal recovery and well-being.

Purpose:

• To investigate the dynamic changes in maternal blood steroid hormone levels during the early postpartum phase.
• To quantify the decline and subsequent maintenance of various steroid hormones after vaginal delivery.

Summary:

• Twenty key steroid hormones, including pregnenolone, dehydroepiandrosterone, estrogens, progesterone, and cortisol, were measured daily in seven women for seven days postpartum.
• Rapid decreases (to ~10% of delivery levels) were observed within 24 hours for free and conjugated E1, E2, P5, free E3, and 16P4.
• Other conjugated steroids (E2, E4, 16P5, P4, 20P4) dropped to <17% within 72 hours but were maintained above 20% through postpartum day seven.

Impact:

• Provides detailed daily profiles of critical steroid hormone dynamics in the early postpartum period.
• Contributes to a better understanding of the physiological significance of these hormones in maternal adaptation after childbirth.
• Establishes reference ranges for postpartum steroid hormone levels, aiding future clinical and research applications.