2 Yolk Sacs... Only One Visible Baby?

Jane Foley's picture

QUESTION

Dear Ms. Ultrasound,
Yesterday I had an ultrasound performed, and I left feeling very confused... the doctor estimated I was 8 weeks and 2 days pregnant based on my last menstrual cycle, but the ultrasound technician gave me no clue as to what the measurements were or how far along I really was. However, there were two yolk sacs on the screen! But there was only one baby visible, and the heartbeat was very very low, 65 bpm. There was only one gestational sac, as well. I have an appt. with a specialist, but I'm hoping that
a) I'm just not as far along as the dr. calculated and that's why the heartbeat was so low or
b) the other twin was just "hiding".

I also have a tilted uterus, so I don't know if that affects how well they can see everything. I've had 2 miscarriages, then 2 perfectly healthy children. Can you please clear up some of my confusion?

ANSWER

Hi
Anytime the fetal heart rate drops below 100 beats per minute, there is great concern.

A heart rate of 65 bpm is too low and indicates a high probability of miscarriage. The fact that there are two yolks sacs means that there was two embryos and one of them did not get large enough to appreciate on ultrasound.

I am so sorry I don't have had better news for you. If you have any further questions just let me know.

With Regards,
-- Jane, RDMS