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Pregnancy is a time when people are discovering large numbers of new terms. Among the numerous definitions you will learn and the ones you are familiar with is one a nuchal Scan. This is an ultrasound scan, usually done at 12 weeks gestation. This scan measures a small amount of water behind the baby’s cervix. as nuchal translucency The baby’s cervix is then examined. A blood sample from the mother, an evaluation of the baby’s nasal bones, and a consultation with the physician. the nuchal translucency Dikte-This allows the caregiver to recognize the possibility that the baby has Down syndrome.
Table of usual values for collar translucency
When the nuchal After the scan, the physician will share the results with you. At that point, a normal The measurement is. For babies with an elevation of 45 to 84 mm: a normal The measurement is less than 3.5 mm. the NT is increasing in relation to the baby.
Doctors consider all babies with NT less than 1.3 mm to be at low risk for Down syndrome. However, babies with NT 6 are at greatest risk for Down syndrome and other possible chromosomal abnormalities. The following table shows the general measurements considered normal at this stage of pregnancy.
Pregnancy
Normal measurements
At 11 weeks.
*Note: 9 of the boys are 2, 5-3, 5mm wide be normal .
12-13 weeks.
1, 7 mm (50th percentile thickness)
2, 8 mm (95th percentile thickness)
Why is it necessary to undergo ultrasound of the carotid artery?
Studies have shown that a large portion of the overall NT is caused by water accumulation, and this accumulation is associated with the presence of certain fetal criteria. For example, an increase in NT measurements can indicate that the baby has a chromosomal abnormality such as trisomy 13, 18, or 21, or a structural problem such as a heart defect. It does not mean that the baby has a problem. It just means that the risk is high.
- Trisomy 21 (also known as Down syndrome).
This condition means that the baby has an extra chromosome 21 in every cell of the body. It affects 1 in 600 babies born in the United States. Certain difficulties, such as mental disadvantage and physiological problems, are associated with the extra chromosome which can lead to heart defects and intestinal problems.
- Trisomy 18 (also known as Edwards Syndrome)
This condition leads to serious birth defects and usually results in the death of the baby during the baby’s time or shortly after birth. The baby has auxiliary chromosome 18 in every body cell.
- Trisomy 13 (also known as Patau syndrome).
In this condition, each cell has an auxiliary chromosome 13. This condition usually quickly leads to numerous permanent imaginations. These babies probably die during gestation or shortly after birth and still do not have the highest life expectancy.
The nuchal translucency normal range The table will likely help health care providers prepare for these in case NT is not available. of normal range .
How is the nuclear translucency scan performed?
First, the timing of this particular scan is very important. A woman must be 11 months and 2 days gestation 14 months pregnant to obtain the best results. By that time, the baby’s length is between 45 and 84 mm from the crown to the ramp. Usually, a brief developmental scan is done during this period. The baby’s heartbeat can usually be heard for the first time at this time.
The scan is performed with the normal insertion of an ultrasound device and a stick into the belly, as opposed to the vagina. It is more painful, but there is pressure to apply a small bar to get the best picture. Before the scan, fresh gel is placed on the belly.
During this scan, the baby is measured from the top of his (or her) head to the bottom of the backbone. Width the nuchal Moisture is measured by the cause of the baby’s neck. This is the area that appears dark and the baby’s ridges look like snowflakes.
During this scan, the baby’s skull and belly can be seen. You can also see the baby’s arms and legs and head, backbone and limbs. A more thorough scan, in which anatomy can be seen, can be made within 20 months.
What happens if the test results are abnormal?
The nuchal translucency normal range The graph is considered a check during this scan. Thus, it indicates that there may be abnormal anatomical structures. be normal and is normal For many men. However, it does not mean that your baby has Down syndrome. It has been shown that this screen can identify most babies with Down syndrome. It does not mean that you will probably have a baby with Down syndrome when the scan is out. the normal range It also means that some babies with Down syndrome will not be detected by this scan and test method.
If there are problems at this stage, there is an opportunity for invasive studies such as amniotic fluid fluid if needed. If not, these problems such as split backbones, blockages, foot feet, and split palate will become more apparent at the 20-week ultrasound.
How accurate is it?
It has been shown that 77% of babies with Down syndrome are detected. However, the false positive rate for NT scans is about 5%. This means that children at highest risk are tested but ultimately not free from Down syndrome. The complexity of the blood NT scan decreases the likelihood of a false positive result. This is because the highest HCG and PAPP-A hormone levels are found in children with Down syndrome. Therefore, the NT scan results with the highest risk and highest values of these hormones generally give a clear indication that the baby has Down syndrome.
When the blood and NT tests are done together, the accuracy increases to about 90%. However, with the total test, the percentage of false positive results is still 5%. The results, the nuchal translucency normal range card remains in the inventory that may be needed, but is not considered a commitment of difficulty or inaccessibility.
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