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Ultrasound shows yolk sac but no fetal pole. Why is this so?

during my first u/s a yolk sac was seen and fetal pole could not be visualised and gestational age was 6w 6d, and was asked to repeat scan after 1 week . in my second u/s , gestational age is 7w 2d, yolk sac seen and shows 3 in number measures 5mm to 6mm, but the fetal pole could not be seen, could u plz tell me why is this so and is there any problem with this? plz help me as soon as possible
Asked On : Tue, 29 Jan 2013
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OBGYN 's  Response
Mar 2016
Early USG scan (abdominal) may not reveal detailed view about fetal pole or heart beat. Basically it is seen around 7-8 wks in case of USG scan and around 6 wks on TVS scan. So it is better to undergo one TVS scan for confirmation of fetal viability. Otherwise it may turn to miscarriage.
Take folic acid supplements, protein rich diet, avoid long journey/heavy work, maintain personal hygiene, take adequate rest.
Be well and take care.
Answered: Wed, 30 Jan 2013
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OBGYN Dr. Nilofer AR's  Response
Thanks for the query.

Visualisation of a yolk sac is useful in distinguishing an intrauterine pregnancy (IUP) from a blighted ovum, as it is only seen in IUP.

If the MSD is 16 mm or greater and no fetal pole / yolk sac on trans-vaginal scanning then this suggests a non-viable pregnancy . Repeat scanning with an larger MSD and serial quantitative beta-HCG levels.

In a normal early pregnancy, the diameter of the yolk sac should usually be

Visualisation multiple yolk sacs is the earliest sign of a polyamniotic pregnancy, e.g twins.

I recommend you to get a doppler done to visualize heart beat.

Hope this helps,
Dr Nilofer
Answered: Wed, 30 Jan 2013
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