In which condition would human chorionic gonadotropin (hCG) levels be expected to be lower than normal for gestational age?

Human chorionic gonadotropin (hCG) is a hormone produced during pregnancy, primarily from the placenta after implantation. In a normal pregnancy, hCG levels increase as the gestation progresses. In the case of an ectopic pregnancy, the implantation of the embryo occurs outside the uterus, often in the fallopian tubes, which can result in atypical hCG production. Since the placental tissue development is less than what would be expected in an intrauterine pregnancy, hCG levels may rise more slowly or remain lower than the normal range for gestational age.

This condition is significant because it highlights the importance of monitoring hCG levels in suspected ectopic pregnancies. Elevated levels often indicate a possible complication, while lower levels may point toward abnormal tissue development or indicate that the pregnancy may not be viable. Understanding the expected hCG levels aids in diagnosing and managing ectopic pregnancies effectively.