How to calculate gestational age and date of birth: correct calculation
gestational age, or the age of the child during pregnancy is calculated from the first day of the last menstrual period, followed by pregnancy and is the same pregnancy.Since the exact date of conception almost always unknown, it is the first day of the last menstrual period is used to determine the age of the child.
How to calculate gestational age?
- last menstrual period if the period comes regularly and can safely be called the start date of the last menstrual period, from this date, you can calculate the gestational age of the child (and, accordingly, the period of pregnancy).Age of the child during pregnancy is calculated from the first day of the last menstrual period, and not from the date of conception Conception, ovarian cycle, fertilization and genetics baby .
- ultrasound if Menses irregular, or the date of the last menstrual period, you simply do not remember, to determine the age of the child in the womb is suitable ultrasonic method.To determine gestational age using ultrasound can at the earliest stages of pregnancy - from fifth to sixth week after the last menstrual period.This method is best applied in early pregnancy - about the eighth to the eighteenth week of pregnancy.With the help of ultrasound determines the size of the fetus and then, if they deviate from normal values at a certain stage of pregnancy.
How to calculate the date of conception?
- If the pregnancy is normal: with regular menstrual cycle menstrual cycle and its response Conception usually occurs eleven-twenty-one days after the first day of the last menstrual period.However, in most cases, to determine the exact date of conception is usually impossible.
- In special cases: the exact date of conception is known in special cases - for example, by artificial insemination or in vitro fertilization.
How to determine when labor begins?
Estimated delivery date is calculated from the date of the last menstrual period: labor begins at a mean of forty weeks after the first day of the last menstrual period.However, these calculations rely not: according to statistics, only five percent of the deliveries begin in due time.