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Is it possible to see the embryo in the fourth week of pregnancy?

By Zaira Salvador.
Last Update: 09/05/2017

The embryo is so small in this fourth week that it is not possible to see it by ultrasound. The first structure detected in an ultrasound is the gestational sac, which usually measures about 2 millimeters (mm) in diameter in week 4 + 2 and usually grows 1 mm per day.

Sometimes, it is also possible to visualize the yolk sac, a small sphere filled with fluid that is inside the gestational sac. Although the yolk sac is detected before the embryo in an ultrasound scan, its presence is positive, as it rules out a possible anembryonic pregnancy.

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 Zaira Salvador
Zaira Salvador
BSc, MSc
Embryologist
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV
Embryologist. Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI) License: 3185-CV.
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