Possible Vanishing Twin

Jane Foley's picture


Dear Ms. Ultrasound,
I'm 6 weeks pregnant and went for a early ultrasound at exactly 6 weeks. I was told by the Dr that there was two sacs visible; one larger than the other which had a heartbeat of 107bbp. The other sac was slightly smaller with no yolk or heartbeat visible. The Dr told us to not take it too seriously as it looks to be like a vanishing twin.

We have had 1 late miscarriage and 3 early miscarriages over the last two years which makes us very nervous about this pregnancy, hence the early ultrasound. Is it possible that it was too early to see the other twins heartbeat or have we lost the baby?



Hi There, Twins should develop at a fairly equal rate. I think if a gestation was seen with a fetal pole and a heartbeat, at least a yolk sac should have been apparent in the second sac if it was growing normally. I am sorry to hear about your previous miscarriage history. This does put you into the high risk category so you will be monitored well. It does not take long to know if the pregnancy is doing well with follow up ultrasounds.

I hope this is the pregnancy that goes to term for you.

With Regards,
-- Jane RDMS