Determination of gestational age .How to properly and accurately determine the time of pregnancy .
Motherhood / / December 13, 2017
Why is it important to know the period of pregnancy?first thing that the doctor at the reception of a pregnant woman - sets a date for delivery.Know the stages of pregnancy is very important for many reasons, and not just to a woman could own to prepare for childbirth.It is also the main criterion by which determine the correct development of the baby in the womb.Doctor prescribes tests, surveys, watching the prenatal development of the child.Knowing the main stages of the correct development of the child, comparing them with the results of research on a specific term, doctors can correct minor inconsistencies.In addition, the definition of pregnancy is necessary and for documentation parental leave.By law a woman can go on maternity leave towards 30 weeks of pregnancy.
Thus, the exact birth date - an important point.With the use of modern apparatus today, it can be calculated up to one day.Laboratory tests are carried out in strictly certain days.For most women and their families, there is also the psychological moment.On the one hand, the need to buy household items and clothes for the baby, on the other hand it is important to maintain the health of the baby as premature and delayed delivery can be complicated.
birth Date of last menstrual period (Negele formula)
Duration of pregnancy - about 10 lunar months (40 weeks or 280 days).Doctors distinguish between maternity and real (true) pregnancy.The easiest way to count down the time on the exact setting as ovulation date can be changed.Midwives take into account the date of the last menstrual period (as rule- 1-1, 5 days), from that moment the egg begins its development and maturation, in the future it fertilizes the sperm.Obstetric calculation to determine the date of birth on a simple formula - from the last menstrual period of the first day, you subtract 3 months and add seven days.
Date of birth on ovulation
So ordered nature that conceiving a child can occur only during ovulation when the mature egg leaves the ovary to "wait for" sperm in the fallopian tubes.If intercourse takes place and the meeting happens, the probability of conception is very high.Ovulation takes about a day, at this date, and a determination timing of future births.Sometimes the ovaries are resting, and ovulation in a woman's body does not occur.A young healthy woman, this may be about 1-3 times a year, in women older of months more.True and maternity pregnancy differ by about two weeks.At 28 days of the menstrual cycle ovulation occurs on day 14, when the number of days in a cycle of the other - and the time of ovulation is shifted.Hence, some differences in terms of pregnancy on the date of ovulation.
How to determine ovulation?To this end, developed special tests, which can be purchased at any pharmacy.Another way - regular changes in basal body temperature.In the first half of its value will be lower than 37 degrees, then it is reduced (the day before ovulation).Ate the temperature rose above 37 degrees, and there is no disease - it can be assumed with high probability that this is the day of ovulation.Thus, the pregnancy period starts with the raising of the temperature above 37 degrees.
Some women define the day, listening to your body.It may be some distinctive symptoms - there is a characteristic pain in the abdomen and the specific allocation, increased libido.This sensitivity helps them to more accurately determine for themselves the date of delivery.
Determination of the date of the pregnancy ultrasound
But the most accurate way is still considered an ultrasound.The only way to know for sure that ovulation occurred on that day.This would have several days to go to the US, which is inconvenient both financially and physically, and it is worth spending time just because of the choice?Moreover, it is worth to suffer just a little bit, and delivery date can be determined much more accurately.Diagnostic ultrasound conducted at 12,20,32 weeks, but to determine the date of birth can be more reliably only in the early stages of pregnancy.
fact that up to 6-7 weeks the embryos grow proportionally, and their sizes are virtually identical.The longer, the more they differ from each other in size and appearance.The value will be the appearance of the parents, weight, height and so on.Why is it important to pass ultrasound in early pregnancy?The accuracy regarding the date of birth after 8-12 weeks of declines due to the different development of children.Doctors can make mistakes and make a diagnosis "Intrauterine growth" that could hurt future woman in childbirth.This most often happens to women with low weight.
Determination of gestational age with gynecological examination
For this reason, gynecological examination in the first weeks of pregnancy can give more information about the expected date of delivery, as the uterus increases in a certain order.Experienced gynecologists determine delivery dates during vaginal examinations up to one day, but only about 7-8 weeks.For example, in the uterus 4 weeks the size of a hen's egg, and 8 weeks already quill.About the size of the second trimester fetus in different women at the same period is different, so the data and vaginal examination may not be as accurate in the first weeks.
first stir - how to determine the gestational age
woman pregnant for the first time tend to feel your baby move at 20 weeks.Multiparous women hear it even earlier - at 18 weeks.Be sure to inform the date of the first stirring of the gynecologist - she entered into the map, and is of great significance in determining the timing of pregnancy and birth date.By the date of the first perturbation added 4.5 months for nulliparous women and 5 months (18 weeks) for multiparous women.This method is only an auxiliary, as some women, especially slender, may feel perturbation earlier or later than usual time.But many doctors believe that the motion before the time of the child feel impossible.Women take over the wiggling motion of gas in the intestine, because many during pregnancy increased flatulence.
Determination of gestational age by measuring the length of the uterus and the fetus.
more sophisticated way of calculating the term of pregnancy is associated with the measurement of the size of the uterus.Most definitely it will make a gynecologist.The bladder should be empty, to eliminate measurement errors.Lying on the couch woman should straighten the legs.Measuring tape or tazomera measured the length of the uterus.It is believed that it is equal to the number of weeks.Example: uterine length 35 cm - and then the gestational age of 35 weeks.
Thus, having in your arsenal several ways doctors can more accurately determine the date of birth.Sometimes there are differences in different ways, but they are minimal - no more than a week.For the development of pregnancy, this is not essential.And not always coincides with the birth date, set by the doctors.Much depends on the gestational development of the fetus, as well as the genetic characteristics of the parents.If the birth occurs plus or minus a few days of life, no reason to worry.
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