Gestational Age Determination by Ultrasound
How to determine the gestational age?
Usually, the first day of your last period is taken to determine your pregnancy and due date, not the day of conception. Why is it the first day of the menstrual cycle that is taken as the starting point, because conception has not yet occurred?
The thing is that it is very difficult to carry out such calculations with accuracy, even the gynecologists themselves cannot always correctly name the date of birth. Also, not all women know exactly when they got pregnant.
However, based on the menstrual cycle when determining the age of the embryo, women notice some discrepancies between the doctor's calculations and the ultrasound results. Typically, the date discrepancy is approximately 2 weeks.
Ways to determine the duration of pregnancy
Ovulation is the period of the menstrual cycle when the likelihood of conception increases. It is by the date of ovulation that you can find out the most accurate age of the embryo. There are certain signs that allow you to determine the period of maturation and release of an egg from the ovary, by which a woman is guided in the approach of a favorable period for conception.
These features include:
- lower abdominal pain;
- increased libido;
- mucous vaginal discharge.
Ovulation can also be calculated by using special tests or by measuring basal temperature. The most common way is to determine the duration of pregnancy by menstruation, which is carried out using the Negele formula.
For calculations, a woman must know the exact date of the first day of the last menstrual period, on the basis of which specialists will say not only the day of birth, but can also track the pregnancy by weeks.
If a woman goes to see a doctor before the next menstruation, gynecologists will be able to tell when conception has occurred during the examination based on certain signs. In this case, experts talk about pregnancy based on the size of the uterus.
An experienced specialist using a vaginal examination can give the age of the embryo with an accuracy of one day. The gestational age after 12 weeks, based on the size of the uterus alone, is no longer possible to establish.
This is due to the fact that starting from the second trimester, several women can have completely different uterine sizes at the same age of the fetus. They are determined by the physiological characteristics of the pregnant woman's body and the weight of the embryo.
Starting from 12 weeks, you can establish the age of the embryo using ultrasound, but this method is also not always reliable, nerAccurately obtained data may be erroneous.
This is due to the fact that each child is characterized by his own individual constitutional characteristics. In some cases, gynecologists state a delay in the intrauterine development of the embryo, but in reality this may not be the case.
According to the results of ultrasound, specialists can talk about delayed intrauterine development in the case of an incorrectly set date of conception or with a small weight of the baby. A non-existent delay in the development of a child is most often given to women of a fragile physique.
In principle, if you argue correctly, the weight of a newborn can be in the range of 2800-4000 g, so all children cannot be equated to one indicator. Knowing how to determine the gestational age, you can accurately calculate the due date, preparing for the birth of the long-awaited baby.
How do I know the due date?
In fact, it is not so difficult to find out the estimated day of birth on your own. It is known that the average period of bearing a child lasts forty weeks, or 280 days. Based on this, it is necessary to add 280 days to the first day of the last menstruation - this will be the estimated day of your baby's birth.
Many women are interested in how gynecologists determine the gestational age. In practice, obstetricians-gynecologists carry out calculations in this way: by the first day of the last menstruation, they add seven days and take three months. Most likely, in this way, the gynecologist will find out the estimated date of your birth.
Currently, an automatic calculator is popular among pregnant women, with which you can not only find out the date of birth, but also determine the duration of pregnancy by week.
Using such a convenient system, it is still important to remember that this is the obstetric period of pregnancy, it differs from the gestational one by about two weeks, because ovulation occurs in the middle of the cycle. For example, if, according to the results of calculating conception by menstruation using a calculator, the period is 15 weeks, then the actual age of the embryo is 13 weeks.
Such an automatic system is suitable for those who want to learn how to independently determine the gestational age without material costs.
As you can see, it is not difficult at all to calculate the day of ovulation and determine the gestational age! Successful conception and health of your future baby!