Enlarged Yolk Sac During the First Trimester?

Touch of Blue III
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Yes, There Is Hope Even with a Large Yolk Sac!

When a woman is told she has an enlarged yolk sac during the first trimester, often she is told there is no hope and miscarriage is inevitable.

The reason for this page is that indeed there is hope!

Thanks to the Misdiagnosed Miscarriage site and the numerous misdiagnosed miscarriage stories, we now know that there are women who continue their pregnancies even with an enlarged yolk sac.


I am not a medical professional. The information I share is meant to supplement the information given you by your doctor. If you feel your doctor is not doing enough for you or not willing to listen to your concerns, I strongly encourage you to take what you've learned here and get a second opinion.

Do you or did you have an enlarged yolk sac?

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The Yolk Sac

So, what is this thing known as the yolk sac?

Very simply, the yolk sac provides the earliest nourishment to the baby. Toward the end of the first trimester the yolk sac will begin shrinking as the placenta takes over the job of nourishing the baby.

According to Embryo and Fetal Pathology "The detection of a yolk sac excludes the diagnosis of a blighted ovum because a viable embryo is necessary for yolk sac development." Basically, if a yolk sac is seen during a trasvaginal ultrasound, you cannot be diagnosed with a true blighted ovum. This does not mean miscarriage in not a possibility. It just means this is not a blighted ovum.

Generally, a yolk sac can be seen as early as five weeks during a transvaginal ultrasound. However, many women have said their doctors never saw the yolk sac during the ultrasound and later found their babies. This just shows that, yes despite some medical literature indicating otherwise, yolk sacs are not always visible in viable pregnancies. In my own pregnancy, misdiagnosed as a blighted ovum, nothing was seen in the gestational sac until it was 28.5mm. Even at 21.5mm a week earlier, the gestational sac looked completely empty. Because of my story and many other misdiagnosed stories like mine , we now know that the medical literature is not always correct about when the yolk sac should definitely be seen.

An Enlarged Yolk Sac

what the medical literature says

Most women who are told they have an enlarged yolk sac are told they should expect to miscarry. Since we know women do go on to have successful pregnancies despite a large yolk sac, why are they told this?

WARNING: before you read, remember, we have stories to show this is wrong!

An example of the medical literature gives the reason why. In the Core Curriculum - Ultrasound, the author states:

"An abnormal appearance of the yolk sac correlates with early pregnancy failure. The yolk sac may be too large (6mm). Differentiation of an enlarged yolk sac from the amniotic cavity is difficult but irrelevant because any empty cystic structure whithin the GS larger than 6-mm diameter predicts a failed pregnancy."

Here we have a basic text that gives no hope to women with a yolk sac larger than 6mm. Fortunately, real life stories show that there is hope. Of course, the pregnancy may end in miscarriage but miscarriage is certainly not a given with an enlarged yolk sac.

Some Case Studies:

Very Large Yolk Sac and Bicornuate Uterus in a Live Birth A case report in which a yolk sac was measured at 8.1mm but resulted in a live birth. This report states that "the quality of the yolk sac might be more important than its size."

Abnormal sonographic appearances of the yolk sac: which can be associated with adverse perinatal outcome? This study does recognize the risk of miscarriage with an enlarged yolk sac but only about 1/3 of the subjects miscarried. A better way to look at is that 2 out of 3 women did not miscarry! Keep in mind, even with a normal pregnancy, that risk can run about 20% so there is a slightly increased risk of miscarriage. Miscarriage in NOT written in stone and most women go on to carry their pregnancies to term.

I believe every woman deserves to have no doubt before having her pregnancy ended.

Important New Guidelines for Diagnosing a Miscarriage

The UK is the first to acknowledge that misdiagnosed miscarriages are indeed a problem. The Royal College of Obstetricians and Gynaecologists has revised its guidelines. If your gestational sac is more than 25mm and/or the CRL is 7mm or more, you should wait a week to verify (if there are no complications). If the measurements are less, you are too early to diagnose. For more information (and something to take to your doctor), please, see my new page:

New Blighted Ovum Guidelines! You ARE Being Diagnosed Too Soon!

If I don't reply to you here, please feel free to e-mail me directly at misdiagnosedmiscarriage@gmail.com Thank you!

Thanks for reading.

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Leave a Comment 64 comments

Cari Kay 11 profile image

Cari Kay 11 14 months ago Author

How are you doing?

LuciaEllise 14 months ago

Hi Cari Kay thank you for your encouraging words. The last time I commented here was the result of my ultrasound 2 weeks ago. Last monday Nov 30, I went to my Doctor to have a follow up check up. The baby should be 8 weeks that time and when the doctor did the transvaginal ultrasound we saw my baby with a very very faint heartbeat and just the size of 3.90mm with 7.0mm yolk sac. My doctor told me to have another ultrasound after 5 days, but I think I am now miscarrying because I aaj bleeding right now.

Cari Kay 11 profile image

Cari Kay 11 14 months ago Author

It is so early. Best thing is to wait one week, if there are no complications, and have a follow-up ultrasound. (((hugs)))

LuciaEllise 15 months ago

Hi everyone. I just want to ask if someone here have the same experience as mine . Im 6weeks prego, my CRL size 3.70mm(too smal),HB is 106 and yolk sac size is 6.80mm . Did it turn out well?.thank you.

Cari Kay 11 profile image

Cari Kay 11 21 months ago Author

You don't need a yolk sac measurement. Really, it's not important. More importantly, you want to monitor the size of the gestational sac if it is growing. You've seen the baby though and really you only a need an ultrasound one week out to verify. I do hope you get better news. (((hugs)))

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