How long are you? or when do you get out of accounts? are the questions a woman hears the most when communicating that she is pregnant. To answer these questions it is necessary to know the gestational age of pregnancy or what is the same, the time that elapses from the first day of the last menstruation (FUR) to the determined or current moment of pregnancy.
On average, the gestational age of a pregnancy with a single fetus has an average duration of 280 days or 40 weeks from the date of the last menstrual period. This allows us to know the estimated date of delivery (FPP).
Gestational age is measured or calculated in weeks and there are several rules to determine the time of gestation or the probable date of delivery. The best known are three:
1. Naegele's rule: It consists of adding 7 days to the first day of the last menstruation and subtracting three months.
2. Wahl's rule: to the first day of the last menstruation you have to add ten and then go back three months.
3. Pinard's rule: At the end of the last menstruation, add ten days and go back three months.
If the date of the last menstruation is unknown or the periods are not usually regular, another way to know the gestational age of the pregnancy is through some baby measurements that are taken through ultrasound such as: the length of the caudal skull, the biparietal diameter, the cranial perimeter, the length of the femur or the abdominal perimeter.
Gestational age allows you to know how the pregnancy develops and to determine if the parameters that are analyzed in the baby correspond with the normal ones for that stage of gestation.
A normal pregnancy can range from 38 to 42 weeks. Babies born before 37 weeks are considered premature and after 42 weeks they are considered postmature.
Gestational age is useful for gynecologists and obstetricians to determine, for example, whether it is feasible to advance a delivery in the event of certain problems during pregnancy or to indicate the maximum day they can wait (after the 40th week of gestation) before taking the decision to induce labor.
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