How to determine the gestational age ?

How to determine the gestational age ?

Gestational put gynecologist at the first visit of the expectant mother in the antenatal clinic.There are several important reasons to establish an accurate gestational age.Knowing the duration of pregnancy, you can follow the development of the fetus and correct the probable lag in its prenatal development, and most importantly, you can set the estimated date of birth.

Types gestational

There are two types of pregnancy.

Obstetric Obstetric

deadline starts ticking from the first day of the last menstrual period.This happens because it is from this day the egg begins to develop, which subsequently sperm fertilizes.The zygote is formed and then implanted into the uterus.From zygote develops from the fertilized egg embryo, and after 12 weeks of pregnancy the embryo becomes a fetus.


true life comes later midwifery for two weeks.It starts counting from the day of ovulation and conception.Therefore, in order to calculate the true duration of pregnancy, it is simply to add two weeks to the obstetrical deadline.

How to determine gestational age and date of birth?

There are several ways to determine the duration of pregnancy and the expected date of birth.

On the first day of the last menstrual period

Negele There is a method in which produce counting from the first day of the last menstrual period, from that date, three months ago, and then add 7 days.The resulting data will be exemplary day delivery.

By date of the first stirring of the baby

If a woman gives birth for the first time, to determine the date of birth, the date of fetal movements added 20 weeks.If multiparous woman, then added 22 weeks.But this method is for determining the period of pregnancy and labor is not essential because perturbations feeling usually quite subjective.A woman may be confused kid with motion processes that take place in her gut.

prenatal visits

The doctor can also determine the approximate date of birth.Undoubtedly, it is important that the woman appealed to the antenatal clinic as soon as possible after the establishment of pregnancy.The error can be avoided or minimized if a woman will address in the first 12 weeks of pregnancy.

There are some objective evidence, which can set the duration of pregnancy:

  • uterine size;
  • height of uterine fundus;
  • volume of the stomach;
  • kid length and the size of his head.

to determine the terms on objective grounds, the physician focuses on the existing criteria.

For example, in the fourth week of pregnancy (the first obstetric month) the uterus becomes the size of a hen's egg, at eight weeks (the second obstetric month) uterine size of a goose egg, and the twelfth week (third obstetric month), the uterus reaches the fetal head size.

to determine the time of pregnancy, safer access the most reliable methods (determination of the date of ovulation, ultrasound).

Knowing that the target date is only an approximation, is of great importance for the mental equilibrium of the future mother.After all, a woman is tuned to a specific delivery date, and if the fight does not come at the appointed time, it is experiencing a lot of stress.It appears fear and anxiety for the baby's health, which could lead to attempts to stimulate labor.Hospitalization ahead of time takes only more anxiety and negative emotions.

only kid knows when it is better to be born.Any prescribed period of pregnancy and the expected birth, even when using a plurality of different ways, there may not be one hundred percent accurate.