Yolk sac size comparison chart

The yolk sac refers to the initial substance of the embryonic tissue. Since the fetus has not yet developed at this time, it is only called the yolk sac. The size of the yolk sac is of great significance to pregnant women and will directly affect the outcome of their pregnancy. Then let’s take a look at the yolk sac size chart!

When a woman is about 5 weeks pregnant, the yolk sac will appear immediately. The yolk sac is generally between 3-5mm in size. Some pregnant women's yolk sac may exceed this value, but as long as it does not exceed 8mm, it is normal. The yolk sac will expand as the pregnancy progresses, but after reaching a certain size, it will gradually shrink and eventually disappear.

The size of the yolk sac is generally determined by its length and width, with the thickness diameter used as the standard size for determining the yolk sac. Therefore, we can generally estimate the gestational age of the pregnant mother according to the above formula, which is the length plus the width plus the height of the yolk sac. After dividing the sum by 3, the final result is added by 25. The result is the number of days the pregnant mother has been pregnant.

How much does the yolk sac cost in the normal range?

The size of the yolk sac is of great significance to pregnant women. By examining the yolk sac, the development of the embryo can be judged. However, I often hear expectant mothers discuss the issue of yolk sac size, worrying that their yolk sac size is abnormal and feeling terrified. So, how much is the normal range of yolk sac?

The yolk sac can be seen at 5-6 weeks of pregnancy. The yolk sac is located in the theca sac and is produced by the extraembryonic endoderm and extraembryonic mesoderm. A normal yolk sac is about 3-5mm, usually less than 8mm, and will gradually shrink with the number of weeks of pregnancy, eventually disappearing.

There is no accurate standard value for the normal range of the yolk sac. It is usually calculated based on relevant formulas. As long as the expectant mother can understand the various data in the B-ultrasound report, she can calculate the size of the yolk sac according to the company. The approximate pregnancy time can be calculated according to this formula =〔(XYZ)/3〕25. Where XYZ represents the length, width and height of the fetal sac, expressed in centimeters (mm).

The yolk sac is closely related to various indexes of the expectant mother's pregnancy. However, it should be noted that under normal circumstances, the yolk sac will not exceed 8mm. Of course, a smaller size is also an abnormal value. All expectant mothers should have regular prenatal check-ups and pay attention to changes in various data.