Circulating maternal serum progesterone in high-risk pregnancies

Area of Science:

• Reproductive Endocrinology
• Maternal-Fetal Medicine
• Clinical Biochemistry

Background:

• Serum progesterone is a key hormone in pregnancy, primarily produced by the placenta.
• Assessing placental function is crucial for monitoring pregnancy health and fetal well-being.
• Previous studies have suggested potential correlations between serum progesterone and placental status.

Purpose of the Study:

• To evaluate serum progesterone levels in a diverse cohort of pregnancies, including normal and complicated cases.
• To determine the utility of serum progesterone as an index of placental function.
• To compare progesterone levels across different pregnancy conditions such as hypertensive disorders, multiple gestations, and fetal demise.

Main Methods:

• Competitive protein-binding assay was used to measure serum progesterone.
• A total of 331 normal pregnancies (6-42 weeks) were studied.
• Serial progesterone measurements were performed in specific complicated pregnancy groups.

Main Results:

• Serum progesterone remained within normal ranges in severe hypertensive disorders of pregnancy.
• Progesterone levels were similar in cases with and without fetal growth retardation.
• Elevated or normal progesterone levels were observed in twin and triplet pregnancies, particularly after 33-34 weeks gestation.
• Normal progesterone levels were noted in anencephalic pregnancies and most cases of intrauterine fetal death.

Conclusions:

• Serum progesterone levels do not consistently reflect placental function across various pregnancy complications.
• The hormone's levels in hypertensive disorders, fetal growth retardation, and fetal death are not reliable indicators of placental health.
• While elevated in some multiple gestations, serum progesterone is ultimately deemed a poor index of overall placental function.