A 23-year-old female asked:
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when is a yolk sac visible on an ultrasound?

1 doctor answer
Dr. Michael Gabor
32 years experience Diagnostic Radiology
Around: 5-6 weeks in most cases.
Answered on May 5, 2017

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Any symptoms?: At this early point in pregnancy not seeing the embryo or heartbeat is not unusual. Be sure to followup with your ob.
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Too early: You are obviously very early in pregnancy and a defined fetus will appear later as you progress.
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Generally: The yolk sac is seen when the mean gestational sac diameter is 8mm and a heartbeat at 16mm. You can get the dimensions of the sac from the ultrasound ... Read More
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