As soon as a woman learns about her pregnancy, she is interested in when the baby is born. Modern medicine provides an opportunity to calculate the estimated term of childbirth as precisely as possible in several ways:
- Obstetrical method, when the expected date of birth is determined by the date of the last menstruation;
- the embryonic expected date of delivery is calculated by the date of ovulation;
- after the first visit to the gynecologist, who after careful examination establishes the expected date of delivery;
- Determination of the expected date of delivery by ultrasound.
In addition to all these methods today there is a special online calculator with which you can calculate the term of delivery. For this calculation, you only need to know the date of the last monthly period and the program will automatically calculate the length of the birth by weeks.
How to calculate the term of labor for a month?
One of the most famous and popular methods for determining the duration of pregnancy is the obstetric method. This method of calculation is called the Negele formula, which makes it possible to calculate the term of birth using the data on the last monthly. For such calculations, there is a special pregnancy calendar, according to which the development of a fertilized egg is easily and quickly determined.
So, the formula of Negele helps to calculate the term of birth by conception. To do this, from the first day of the last month they take three months and add exactly one week. That is, it turns out that the first day of menstruation is added forty weeks. This method is quite simple, but not the most accurate.
In addition to the calendar method for determining the duration of pregnancy, the obstetrician-gynecologist examines the patient, which determines the presence of pregnancy and the expected term of childbirth. To determine this diagnosis, the doctor measures the size of the uterus, determines the height of its bottom, measures the volume of the abdomen. On the basis of such measurements it is possible to assume the size of the fetus and the duration of pregnancy.
Embryonic method of calculating the date of delivery
Calculate the estimated term of childbirth and can be ovulation, which is considered the most optimal time for conception of the child. Ovulation takes place on the 14th day of the cycle lasting 28 days. If the cycle is shorter or longer, special tables are used for calculation, because ovulation is not always an unpredictable phenomenon. It can occur on both the seventh and the twenty-first day of the cycle.
This method is not accurate enough. But if a woman knows exactly when she is having ovulation and is sure of the date of conception, then it is easier for the doctor to calculate the exact date of childbirth, therefore, if possible, give the doctor as much information as possible.
How to calculate the term of birth most accurately?
Many pregnant women are interested in how to correctly calculate the term of childbirth. After all, I want to be as ready as possible for the forthcoming birth, so that this phenomenon is not unexpected,
In the first trimester, it is difficult to predict the date of delivery, since the embryo remains practically unchanged for three months. But in the second, and especially in the third trimester, the baby actively grows and develops, as a result of which differences at different times can be significant. This makes it possible to establish the expected date of birth with an accuracy of three days.