Plasma progesterone and aldosterone in pregnancy

Area of Science:

• Reproductive endocrinology
• Maternal-fetal physiology

Background:

• Hormonal changes are critical during pregnancy.
• Understanding the roles of progesterone and aldosterone is key to monitoring pregnancy progression.

Purpose of the Study:

• To investigate the dynamic changes in plasma progesterone and aldosterone levels during normal pregnancy.
• To explore correlations between these hormones, weight gain, and gestational duration.

Main Methods:

• Simultaneous measurement of plasma progesterone, aldosterone, and renin activity.
• Serial blood sampling in seven pregnant women from the 2nd trimester until near delivery.

Main Results:

• Plasma progesterone concentration showed a constant increase from the 2nd trimester until approximately 4 weeks before delivery.
• Plasma aldosterone concentration also increased, though less consistently than progesterone.
• Significant correlations were observed between weight gain, duration of pregnancy, and plasma progesterone levels.
• Significant correlations were found between plasma progesterone and aldosterone concentrations, and the progesterone/aldosterone ratio with gestational duration and weight gain.

Conclusions:

• Plasma progesterone and aldosterone levels significantly increase during pregnancy.
• These hormonal increases are closely linked to maternal weight gain and the duration of gestation.
• The progesterone/aldosterone ratio serves as a potential indicator of pregnancy progression and associated physiological changes.