There're three paths for women's body to pass the blighted ovum, either their body expels the undeveloped egg and accompanied with bleeding similar to a heavy period, or taking medicines, or surgical procedure.
First route: If the body miscarry or naturally passes the ovum tissue at the end of the first trimester, the pregnancy hormone (BHCG) will dramatically decrease but may take a day or couple of days to be zero BHCG result.
Second route: when a woman' body can't naturally expels the ovum tissue within a week after the doctor discover the ovum pregnancy by blood pregnancy test and ultrasound, the the woman must take medicines. Cytotec (misoprostol) is an example for the drugs used for miscarriage,, which will cause BHCG level in blood to drop to zero within 24 hours and the blood test results may show a very small reading or show nothing in the blood BHCG test results.
Third route: BHCG level still at below 300, not increasing but can't decrease, which means the blighted ovum still inside right there, the gestational sac and placenta still saving the hCG hormone quantity. A medical procedure is must to avoid complicated condition inside the uterus.
That was how doctors use BHCG lab test results to decide what is proper or not for women carrying invalid pregnancy known as Blighted ovum pregnancy . if you got lab results and want to get professional interpretation with simple medical words then you invited to share your results with our lab professional team.