Serum unconjugated estriol levels during spontaneous labor

Area of Science:

• Obstetrics
• Maternal-Fetal Medicine
• Endocrinology

Background:

• Maternal serum unconjugated estriol (SUE3) is a key hormone during pregnancy.
• Understanding SUE3 dynamics during labor is crucial for assessing feto-placental well-being.

Purpose of the Study:

• To investigate the relationship between maternal serum unconjugated estriol (SUE3) levels and various obstetrical factors.
• To determine if SUE3 levels change during labor and correlate with labor duration, birth weight, placental weight, and fetal distress.

Main Methods:

• Maternal serum unconjugated estriol (SUE3) levels were measured in 244 pregnant women (218 with labor, 26 without).
• Statistical analyses were performed to compare SUE3 levels between groups and assess correlations with obstetrical parameters.

Main Results:

• No significant difference in SUE3 levels was observed between women with and without labor.
• In multiparous women experiencing labor, SUE3 levels showed a gradual decrease with prolonged labor duration.
• Significant positive correlations were found between SUE3 levels and birth weight (r=0.375) and placental weight (r=0.381) in multiparous women with labor.
• SUE3 levels were significantly lower in cases of fetal distress (20.0 ng/ml) compared to those without fetal distress (24.5 ng/ml).

Conclusions:

• Maternal SUE3 levels appear to be influenced by feto-placental function.
• SUE3 levels may decrease with prolonged labor, even after labor onset.
• These findings suggest SUE3 could serve as a potential indicator of feto-placental status during labor.