In the event of a miscarriage, hCG levels typically decrease from previous measurements. For example, a baseline level of 120 mIU/mL that's dropped to 80 mIU/mL two days later can indicate the embryo is no longer developing and the body isn't producing more hormones to support its growth.

How quickly do hCG levels drop after miscarriage?

HCG Levels After Miscarriage

It typically takes from one to nine weeks for hCG levels to return to zero following a miscarriage (or delivery). Once levels zero out, this indicates that the body has readjusted to its pre-pregnancy state—and is likely primed for conception to occur again.

Does hCG drop during threatened miscarriage?

Women with threatened miscarriage in their first trimester who eventually miscarried have lower serum hCG values compared with women continuing the pregnancy and asymptomatic pregnant women.