Obstetrical gestation and real. Determine the duration of pregnancy by ultrasound

Pregnancy is one of the most beautiful periods of life of a fair sex. It should be noted that the medicine knows two options for calculating the time of bearing the fetus in the uterus: obstetric pregnancy and real.

How does it all begin?

For starters, it's worth mentioning how to fertilize. Approximately in the middle of the month the female ovum leaves the follicle and slowly moves along the fallopian tubes. It is here that she meets the male cell. Then the chromosomes merge, and conception occurs. Having descended into the uterine muscle, the fetal egg is implanted into the endometrium, and from that moment it can be considered that the pregnancy took place.

Determination of gestational age

When a woman realizes that she is in an interesting position, the initial task for her is to determine the term. The pregnancy is calculated by the weeks. Usually the time interval during which the baby is in the mother's womb is 40 weeks. A small offset in one direction or another is considered normal and does not require any correction. Doctors distinguish between obstetric pregnancy and real.

Real time of bearing of the baby

This period takes a count from the moment when ovulation occurred. The release of the egg from the follicle is the day from which the real gestation period is calculated. In most women's clinics that monitor the course of pregnancy, this method of calculation is used. If you decide to take a blood test to determine the content of the chorionic gonadotropin in it , you will also be given a result that indicates the real meaning of the term.

Obstetrical gestational age

This time interval begins with the first day of the last bloody discharge from the genital tract of a woman. To calculate the estimated date of birth of a baby, this is the time. Also, many women use this method to determine the duration of pregnancy. That is why so often women have differences with the calculation made by the doctor.

Obstetrical gestation and real

In most cases, the difference between these counting methods is two weeks. With a standard female cycle at twenty-eight days, the egg leaves the ovary just two weeks after the start of the last menstrual period.

However, not all the representatives of the fair sex cycle has a standard length. For example, some ladies ovulate occurs one week after the onset of the last menstruation. In such cases, the difference between the obstetric and real term will be one week.

If a woman has an egg within three weeks after the start of the last period, in this case, the obstetric pregnancy and the real one will have a difference of twenty-one days.

All described situations are normal. That's why the length of pregnancy for weeks should be set taking into account the length of the woman's menstrual cycle. It is impossible to equate all the fair sex to the generally accepted standards. This can lead to an incorrect calculation of the period of bearing of the baby.

Determine the duration of pregnancy by ultrasound

There are situations when a woman can not name the date of the first day of the last month. This situation often occurs if a woman has recently given birth or breast-feeding. In such cases, representatives of the fair sex are recommended to undergo ultrasound examination (ultrasound).

A small gestation period, which is not yet possible to establish by manual examination, is easily diagnosed by ultrasound examination. It is worth noting that a specialist can determine the presence of a woman in the uterus of the fetal egg already since the fourth obstetric week. All measurements and term determinations are calculated with the obstetric method.

The uterus on the early stages of pregnancy grows across, that is, turns from pear-shaped into spherical. Further, when the seats in the small pelvis become insufficient, the muscle starts to slowly rise upward. Her level increases in proportion to the period of pregnancy, with each week becoming higher by one centimeter.

Determine the exact term for ultrasound can only be when the fetal egg is visible embryo. Usually it is quite easy to do this from the sixth to the seventh week of pregnancy for the obstetric term. It is after measuring the length of the embryo-blast that it is possible to calculate, to within one day, the time when conception occurred.

Ultrasound for Pregnancy

Throughout the time when the fetus is in the womb of the mother, the woman regularly conducts various studies. One of the most important is ultrasound.

If you did not have to do an ultrasound at an early date to determine the date of conception, then for the first time with such an analysis you will have to face 10 to 14 weeks. It is then possible to determine as precisely as possible the time during which pregnancy develops. Also on the basis of this study, the term of the expected birth of the baby is established.

With the course of pregnancy, a woman will have to pass at least twice such a test. It will happen approximately from 20 to 24 weeks and from 30th to 34th. It is worth saying that these studies may have a big error. The term of the child's date of birth, established on them, may differ from the actual one for 2-3 weeks. That is why it is so important not to miss the first screening and make ultrasound on time.

Instead of concluding

If you do not know how to count the duration of pregnancy, ask your doctor about it. In most cases, it is sufficient to know the date of the last menstrual period and the length of the female menstrual cycle. If necessary, still conduct an ultrasound. Carry out the calculation in the same way that the specialist uses. Only in this case you will not encounter any discrepancies and will not fall into a disputable situation.