How to calculate the gestational age?
The onset of the gestational period is the immediate time of conception of a new life. But the fact is that not everyone knows this date, and if they do, the exact moment of implantation of the fetal egg is not known, because this can happen within a few days after sexual intercourse. In addition, no one knows when the ovum met the sperm, and their fusion occurred.
That is why the concept of the gestational age is rather inaccurate. In gynecological practice it is customary to use the obstetric method of determining the age of the fetus, as more reliable. It is calculated at the beginning of the last monthly period, and it is two weeks ahead of the real one.
Why so important term? And in order to know the date of termination of pregnancy, that is birth. After all, prematurity and endurance are equally dangerous for the baby's life, and to be able to help in case of premature (before 38 weeks) or delayed delivery (after 42 weeks), you need to know it accurately.
The end of the gestational period is also an interesting concept, after all,
If for some reason, according to menstruation, it is not possible to calculate the time because of its absence (breastfeeding, recent childbirth, hormonal disorders), the main option remains ultrasound. The most accurate time can be set from the eighth to the eighteenth week of pregnancy. It is this diagnosis that will accurately determine the age of the fetus by its size.