How the PDR is calculated
DAF is an abbreviation that doctors use, and it means the following: an estimated date of birth. Yes, it is supposed, because even with all the superior technology, the date of delivery can be calculated with a small error. For example, if a woman had problems with hormones before pregnancy, then she could have a day off ovulation, and pregnancy occurred when it was assumed. One more of the causes of the error may be Multiple pregnancy - Usually, childbirth always occurs before the alleged. It turns out that the DA Date is indirect, from which it is worth repelled, but do not forget that childbirth can occur both a little earlier and a little later, which will be an absolute norm.
Doctors define several types of definition of the DA:
- on the day of ovulation;
- by the formula of the neglect and the date of the last menstruation;
- with ultrasound;
- According to the results of the inspection;
- According to the first movements;
- at the height of the bottom of the uterus;
- in terms of waist;
- By the date of conception.
Calculation of PDR on the Day of ovulation
Immediately it is worth noting that the definition of the exact period of pregnancy and the production of a more or less faithful PDR is possible only when surveying up to 12 weeks. The reason for this is the fact that all people are different, starting with the womb. Some babies are born larger, other smaller, and everything is considered the norm. Only when the child has the weight above average, then the likelihood is that the doctor will give a time longer. Kids whose weight is somewhat less (the cause of weightless weight can be like a delay of intrauterine development, and the physique of the child), the doctor may mistakenly put a period somewhat less.
To refer to the correct term, it is important to pass at least one ultrasound to 12 weeks. At the inspection, the doctor can define weeks with accuracy until the day. Later, with other inspections and surveys it will be possible to repel from the indicators of the first ultrasound.
DRD according to the results of inspection
The system here is the same as when an ultrasound examination: a doctor can determine the term of pregnancy on an inspection of only up to 12 weeks. Later, the development of the fetus can be different and high the likelihood of erroneous period. A week after the start of the delay, the doctor will be able to determine the pregnancy and its term in the form and size of the uterus. Do not forget that doctors prefer as possible to spend gynecological surveys on the chair during pregnancy.
PDR on the first movements
The child begins to actively move in the Mother's womb still on very early time, but the woman does not feel, because the fruit is still too small. Standard doctors believe that with the first pregnancy, the woman feels the first movements of 20 weeks, and in the following pregnancy in 18 weeks. From this period you can repel and calculate the estimated date of delivery as follows:
- Firstborn to the date of the first movements, add 20 weeks;
- During the second and subsequent pregnancies - 22 weeks.
However, often women, especially those pregnancy, are not the first, they say doctors that they feel the movements of the child in earlier deadlines, from 14 weeks. Doctors bind these sensations with the activity of the intestine, and the production date of birth according to the first movement becomes difficult.
PDR at the height of the bottom of the uterus
The doctor can unmistakably set the date of birth when examining, determining the height of the bottom of the uterus. Throughout the pregnancy, the uterus rises above, on the period of 16 weeks it is between the pubic and navel, in 24 weeks in the navel area, 28 weeks a little above the navel. This inspection is carried out not on the gynecological chair, because it is safe for mom and baby.
PDR in terms of waist
Very high accuracy from this method is unlikely to achieve, because the measurement of the abdomen circle - the data is very approximate. It depends on the physique of mom, its initial weight. If mom is pretty chubby, then its volumes will be more than mom is thin. Also during pregnancy, the appearance of strong Edeys Even slender women that provokes high indicators in volumes. So with such an inspection it is necessary to consider all objective circumstances.
DADR by the date of conception
Also a rather controversial method, because it is very high the opportunity to make a mistake in a specific date. As you know, a woman can get pregnant only at certain days of the cycle, approximately 12-14 days. Even if the sexual act was a single, suppose, on the 11th day of the cycle, then the conception itself completely could occur for 12 days. This is due to the fact that spermatozoa can live in the woman's body up to several days and «Wait», When the egg will be ready to take them for fertilization. Therefore, make a mistake with the date on the day or two quite possible.
Even knowing the date of possible delivery, the child is better than us when he should be born. Because doctors put an estimated date of birth by 40 weeks, but the norm is considered the emergence of a child from 37 to 42 weeks. And here, indeed, little depends on the doctors, and from the woman itself.
