What is a fetal egg?
In fact, this is one of the envelopes of the embryo, which at the first stages of gestation promotes the development of the embryo, performing a protective function.
As is known, after the fertilization process, the egg cell undergoes numerous divisions during 7-10 days, moving to the uterine cavity, and only at the end of this time period is implantation.
When can I see a fetal egg on ultrasound?
When answering this question, doctors call the interval of 3-6 weeks. It is at this time that it is possible to visualize this formation in the uterine cavity. Thus doctors use the device with the big magnifying ability.
What diagnostic parameter is used in the study?
The average internal diameter (SVD) allows to estimate the rate of embryo development, to draw a conclusion about the structures of education, its form. The results of this study are entered into the exchange card.
Since the moment when a fetal egg appears, and ultrasound is clearly visible, doctors can perform measurements. The shape of the egg is also evaluated.
So, 3 weeks after conception, it has an oval shape, the SVD is approximately 15 mm. Also on the monitor of the apparatus there is a significant thickening of the uterine endometrium, which confirms the onset of gestation.
At the 5th week of pregnancy, when an ultrasound is performed, the doctor sees that the fetal egg has changed its shape. This corresponds to the norm. It becomes more elongated. The minimum SVD at this time is 18 mm.
By the sixth week of SVD, it is 21-23 mm. At this time the doctor can already conduct an evaluation of the fetus itself.
Thus, as can be seen from the article, in most cases the minimal time period, when ultrasound shows the fetal egg in the uterus, is 3 weeks.