[Human chorionic gonadotropin and its subunits in normal and pathologic pregnancies]

Area of Science:

• Reproductive Endocrinology
• Maternal-Fetal Medicine
• Clinical Chemistry

Context:

• Radioimmunoassays (RIAs) for human chorionic gonadotropin (hCG), hCG alpha, and hCG beta have advanced diagnostic capabilities in pregnancy complications.
• These assays provide quantitative measurements crucial for differentiating normal pregnancy from pathological conditions.

Purpose:

• To evaluate the diagnostic utility of hCG, hCG alpha, and hCG beta measurements in various pregnancy disorders.
• To establish the predictive value of these biomarkers in conditions such as threatened abortion, inevitable abortion, ectopic pregnancy, and toxemia.

Summary:

• In threatened abortion, slower hCG doubling times and low hCG levels indicate impending issues, with predictive values up to 97%.
• Ectopic pregnancies are detected in nearly 100% of cases using sensitive hCG tests, often showing abnormally low levels and increased hCG alpha:hCG ratios.
• Toxemia of pregnancy is associated with elevated maternal serum hCG, hCG alpha, and hCG beta, and a decreased hPL:hCG ratio compared to normal pregnancies.

Impact:

• hCG serves as a reliable trophoblastic marker for diagnosing pregnancy pathologies.
• hCG alpha may function as an indicator of chronic placental hypoxia, offering deeper insights into fetal well-being.
• Enhanced sensitivity and specificity of RIAs significantly improve the accuracy of diagnosing and managing pregnancy complications.