The circumference of the head of the fetus by weeks: table

for all pregnant women is a particular life stage.At this time, the expectant mother is experiencing new sensations and the other side knows its essence.Along with the positive emotions and fantasies about the future of the kid young mother has to undergo a lot of consultation and take a lot of tests.Such visits clinics sometimes forced to be fidgety.But analysis of the need to control the normal growth and development of the baby in the tummy woman.

When ultrasound is necessary

When the expectant mother comes to the reception to his doctor, she explained the need and timing for observation under the ultrasound machine.Are two types of ultrasound: screening and selective study.Screening called mandatory testing of all pregnant women with ultrasound in certain terms.Usually routine ultrasound examination expectant mother goes on for 10 to 12 weeks, from 22 to 24 weeks, and 32 weeks of gestation obstetric 37-38.When carrying out this kind of survey measures the size of the fetus and their compliance with, the gestational age, the condition of the uterus and placenta.Selective appointed study physician, if present suspected a complication of pregnancy.In the case of determining the pathology of pregnancy such surveys can be held indefinitely.

fetometry - what is it and why

One of the important procedures considered fetometry fetus.During the doctor examines the size of the fetus and their compliance with the norm.The procedure is an ultrasound specialist data which compares with the standard table.Check in time helps to detect defects and deviations in the development of the baby.During the fetometry determined by the circumference of the head of the fetus by weeks - the rate is an important indicator.Weekly doctor fixes the value of US and draws conclusions about the health of the baby.When the doctor says the fetus smaller than specified for this period, we speak of fetal growth retardation.If in the course of pregnancy manifested lag for a couple of weeks, the doctors say about intrauterine development.This delay may be caused by bad habits mother, internal infections, chromosomal anomalies or placental insufficiency.

How does the head circumference of growing normally developing fetus

circumference of the head of the fetus by weeks - an important indicator of development of the fetus in the womb mom.As you know, the baby's head in my mother's belly is growing unevenly.At the beginning of its size considerably exceeds the size of the body.By the end of pregnancy, fetal size are uniform and proportionate.If we trace how the fetal head circumference by week, you will notice that the greatest increase occurs in the second trimester.It is from 15 to 26 weeks of pregnancy crumbs head circumference increases an average of 12-13 mm.This increase occurs every week.With further increase of the pregnancy head circumference growth slows.By the end of the third trimester - about a month before the birth of the baby - this figure is greater than the entire 12-15 mm.

How to measure the circumference of the head chips

To measure the circumference of the head of the fetus by weeks, apply a regular diagnosis using ultrasound device.A study carried out by experts in several projections to produce the most correct and accurate result.Besides diagnosing head circumference doctor diagnoses fetometricheskih such indicators as biparietal (BPD) and sagittal size, the length of the thigh bone, abdominal circumference, fronto-occipital (LZR) and other size.

table rules used for the diagnosis, helps a specialist to determine the development of the fetus and potential deviation.If the doctor detects significant deviations from the norm, the woman offered to do an abortion.

formula for calculating

circumference of the head of the fetus is determined by week on the same principle as the biparietal size: measured by a method such as a computer planimetry or formula.Pre-determined biparietal LZR and head size.The formula looks like: OG = 1/2 * (LZR + BDP) * 3.1416.Such an indicator is rarely used for calculating the weight of the fetus and not dependent on the shape of his head.

The value of the circumference of the baby's head

About what can tell the doctor an indicator such as the fetal head circumference of the week?Table rules of this indicator has limits.If they are exceeded, it indicates the presence of disturbances in development.In this case, the main task of becoming a doctor early detection and correction of deviations.For example, increasing the circumference of the head may be indicative of such disease as hydrocephalus.The disease is manifested in the fluid in the ventricular cavities of the brain.This process leads to an increase in pressure within the skull and, consequently, reduce the volume of the brain.Immediately after birth the baby spend a puncture.Use the procedure removes accumulated fluid and facilitate the child's condition.

value indicators for delivery

In most cases, the excess parameters are related to individual characteristics of the crumbs.For example, if the parents are large, it is assumed that the child will also be large.As already mentioned, the table contains the circumference of the head of the fetus by weeks of pregnancy.The increase of the end of pregnancy can lead to problems in the birth process.For example, the tear of the perineum.This is an episiotomy, that is a small incision to facilitate labor.

importance indicator

Thus, the determination of indicators of head circumference at different stages of pregnancy and comparing other indicators helps the doctor to identify the disease in time in the development of fetal growth and development, as well as potential difficulties.A woman should not be interpreted independently or try to decipher the results of ultrasound diagnosis and to draw conclusions about the health of the baby.The doctor takes into account multiple factors and surveillance, and only then make an objective conclusion.It is important to remember that the development of each child individually, and may not occur in the tabulated values.

32 weeks - why it is important

important step in ultrasound diagnosis is a term in the 32nd week of pregnancy.Around this period, the fetus receives the correct position for the process of childbirth - head down.Head circumference fetal (32 weeks gestation) is about 283-325 mm.This period of pregnancy is quite significant.Little baby in my mother's tummy is almost formed and even has eyelashes and eyebrows.

fetal head circumference: table

As mentioned, the first major ultrasound diagnostics expectant mother spends 10-12 weeks interesting position.The table shows the data from the 11th week of pregnancy.The calculation takes place from the date of the last menstrual period.Table presents data on the 10th, 50th and 95th percentiles.Most often, doctors are guided by the 50th percentile, but considered normal fluctuations from 10 to 95. The percentile is the percentage that is below a certain amount of interest in the sample.That is, the 50-percentile indicates that 50% of these values ​​is below this level.

Of course, every woman is more important than the state of small miracle of all.While the crumb is still in the stomach, the only way to see it is ultrasound.The importance of the study of indicators of head circumference, height, weight, and the other due to the need of continuous monitoring of fetal development.This monitoring not only helps experienced properly maintain pregnancy, but also calms the future mum, who want to quickly hold a crumb on his hands.