Gynecologists use several methods to calculate the due date. This allows you to most accurately determine the date of the expected due date. In this case, the norm is a deviation from the calculated date of birth by two weeks. That is, childbirth can occur two weeks earlier or two weeks later than planned. You can calculate the due date in the following ways.
Instructions
Step 1
The most common way to calculate your due date is by using the date of the first day of your last menstrual period. 280 days are added to this day (this is 10 obstetric months or 9 calendar months of pregnancy), the date received is considered the date of delivery.
Step 2
Another simple way to calculate the date of birth - from the date of the first day of the last menstruation, three calendar months are counted back and 7 days are added.
Step 3
You can also determine the date of birth by the date of the first movement of the fetus. This method of calculation is possible only if the expectant mother is very vigilant and attentive to her feelings and remembers (and most importantly, understands that this is a movement) the date of the first movement of the fetus. To this date, during the first pregnancy, 20 weeks are added, and during the second and subsequent - 22 weeks, and an approximate date of birth is obtained.
Step 4
A gynecologist can calculate the gestational age and the date of birth directly from a visual examination, but only on the condition that a woman consults a doctor before 12 weeks of pregnancy.
Step 5
You can reliably calculate the date of birth using ultrasound. At the same time, it is important that the first study is carried out in the early stages of pregnancy - up to 12 weeks. An ultrasound scan performed at a later stage of pregnancy gives less reliable information about the date of birth, since this method of determining the gestational age is based on measuring the size of the fetus, and the growth and development of the fetus during pregnancy is strictly individual.
Step 6
You can calculate the expected due date using the date of your prenatal leave. It is calculated in the 30th week of pregnancy. This means that in order to determine the date of birth, 10 weeks should be added to the start date of the decree.
