The head circumference of the fetus by week: table

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2018-03-21 07:42:26

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For all women pregnancy is a special life stage. At this time, the expectant mother experiences new sensations and the other side knows their identity. Simultaneously with positive feelings and fantasies about the future baby of a young mother have to go through many consultations and run more tests. Such visits to the clinic sometimes make you nervous. But the tests are necessary to monitor the normal growth and development of the baby in the tummy of the woman.

When should ultrasound

head circumference of the fetus at weeks of pregnancy

When an expectant mother comes to your GP, explain to her the necessity and timing of the observations under the ultrasound machine. There are two kinds of ultrasonic research: screening and selective research. Screening called mandatory testing of all pregnant women using ultrasound, in a certain period. Usually routine ultrasound examination of the expectant mother is held at the timing from 10 to 12 weeks, from 22 to 24 weeks, 32 and 37-38 weeks of gestation obstetric. While conducting such kind of surveys to measure the dimensions of the fetus and according to the regulations, the period of pregnancy, as the uterus and placenta. Selective studies are prescribed by the attending physician if there is a suspected complication of pregnancy. In the case of the determination of the pathology of pregnancy such surveys can be conducted an unlimited number of times.

Fotometria – what is it and why

head circumference of the fetus in weeks

One of the important procedures is fetometry of the fetus. When carrying out the doctor examines the size of the fetus and their compliance with the norm. The procedure is an ultrasound examination, which data specialist checks the rate tables. Check helps to detect defects and deviations in the development of the baby. When conducting fotometrii is defined by head circumference of the fetus by week-the norm is an important indicator. For weeks the doctor notes the value of ultrasound and makes conclusions about the health of the baby. When the doctor finds the smaller size of fruit than the established for the given period, it is talking about slowing the growth of the fetus. If during pregnancy appears a lag of a few weeks, doctors speak about the delay of fetal development. This delay can be caused by harmful habits of the mother, internal infections, chromosomal abnormalities or placental insufficiency.

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How does the head circumference growing normally developing fetus

head circumference of the fetus table

Head Circumference of the fetus by weeks – important indicator of fetal development in the womb of moms. As you know, the head of the child in the mother's stomach grows unevenly. Early in the development of its size considerably exceeds the size of the body. And by the end of pregnancy, the size of the fetus becomes uniform and proportional. If the evolution of the head circumference of the fetus at weeks, you may notice that the greatest increase occurs in the second trimester. With 15 to 26 weeks of gestation head circumference crumbs increased by an average of 12-13 mm. This increase happens every week. With a further increase of pregnancy the increase in head circumference slows down. By the end of the third trimester-about a month before the birth of the baby – this rate is more than 12-15 mm.

How to measure head circumference crumbs

head circumference of the fetus by weeks table

To measure the head circumference of the fetus, are subjected to a regular diagnosis using the ultrasound machine. The research is conducted by specialist from several perspectives to obtain the most accurate result. In addition to the diagnosis of head circumference the doctor diagnoses geometricheskih such factors as the biparietal (BDP) and sagittal size, bone length of femur, abdominal circumference, frontal-occipital (LZR) size and others.

A table of rules, applied to diagnostics, a technician can determine the development of the fetus and of potential bias. If the doctor detects a significant deviation from the norm, the woman offer to do an abortion.

The Formula for the calculation

Head Circumference of the fetus by weeks is determined according to the same principle as the biparietal size: measured by this method as computed planimetry, or by formula. Pre-determined and LZR biparietal head size. The formula is as follows: OG = 1/2 * (LZR + BDP) * 3,1416. This indicator is rarely used to calculate fetus weight and does not depend on the shape of his head.

The value of the index head circumference of the child

head circumference of the fetus normal

What to tell doctor an indicator such as head circumference of the fetus in weeks? Table of norms this indicator has its limits. If they are exceeded, this indicates the presence of impairments. In this case, the main task of the doctor becomes early detection of deviations and their correction. For example, increasing head circumference may indicate this disease, as hydrocephalus. The disease manifests itself in the accumulation of fluid in the cavities of the ventricles of the brain. Such a process leads to an increase inpressure inside the skull and, as a consequence, the reduction of the volume of the brain. Immediately after birth the baby, hold the puncture. Using the procedure, remove accumulated fluid and ease the child's condition.

The Importance of indicators for birth

head circumference of the fetus by weeks Norma

In most cases, the exceedances relate to individual characteristics crumbs. For example, if the parents are large, it is assumed that the child will also be large. As already mentioned, the table shows the head circumference of the fetus at weeks of pregnancy. The increase towards the end of pregnancy may cause problems in the birth process. For example, to the rupture of the perineum. When this is done episiotomy, ie a small incision to facilitate labor.

The Importance of the index

So, the definition of the indicators head circumference at different stages of pregnancy and compare other indicators helps the physician to identify pathology in the development of the fetus, growth and development, as well as possible problems. A woman should not attempt to interpret 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 observations, and then makes an objective conclusion. It is important to remember that the development of every child individually and may not occur for tabular values.

32 weeks – why is it important

head circumference of the fetus 32 weeks

An Important step in ultrasound diagnostics is the term in the 32nd week of pregnancy. Around this period, the fetus adopts the correct position for the birth process – head down. The head circumference of the fetus (32 weeks gestation) is approximately equal to mm. 283-325 This period of pregnancy is quite significant. The little baby in the mother's tummy is almost formed and even has eyelashes and eyebrows.

Head Circumference of the fetus: table

As already mentioned, the first important ultrasound imaging expectant mother spends 10-12 weeks an interesting situation. The table shows data starting from the 11th week of pregnancy. This is calculated from the date of the last menstrual period. Presents tabular data for the 10th, 50th, and 95th percentiles. Most doctors are guided by the 50th percentile, but the norm of fluctuations from 10 to 95. The percentile is a percentage that is below a certain amount of interest in the sample. That is, the 50th percentile indicates that 50% of the data values is below this level.

Head Circumference of the fetus - normal, mm

Weeks of pregnancy

Percentiles

10th

50th

95th

11

53,0

63,0

73,0

12

58,0

Compared to 71.0

84,0

13

73,0

84,0

96,0

14

84,0

97,0

110,0

15

110,0

16

112,0

124,0

136,0

17

121,0

Of 135.0

149,0

18

131,0

146,0

161,0

19

: 142.0 cm

To 158.0

174,0

20

154,0

170,0

Of 186.0

21

166,0

183,0

200,0

22

178,0

195,0

212,0

23

190,0

207,0

224,0

24

201,0

219,0

237,0

25

214,0

232,0

250.0 m

26

224,0

243,0

262,0

27

235,0

254,0

273,0

28

245,0

265,0

285,0

29

255,0

275,0

295,0

30

265,0

285,0

305,0

31

273,0

294,0

315,0

32

283,0

304,0

325,0

33

289,0

311,0

333,0

34

295,0

317,0

339,0

35

299,0

322,0

Of 345.0

36

303,0

326,0

349,0

37

307,0

330,0

353,0

38

309,0

333,0

357,0

39

311,0

335,0

359,0

40

312,0

337,0

362,0

Of Course, for every woman as a little miracle more than anything. While the baby is still in the tummy, the only way to see it remains ultrasound. The importancestudies of indicators of head circumference, height, weight and other is caused by the necessity of continuous monitoring of fetal development. Such monitoring not only helps experienced to properly maintain pregnancy, but also soothe the future mother, who wants to hold their baby.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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