![]() It does not mean that only Down syndrome will be found.įetuses with thick NT may have a variety of hidden congenital diseases, such as chromosomal trisomy, other chromosomal abnormalities, microchromosomal abnormalities, diseases caused by genetic mutations, heart and bone diseases, diseases of the abdominal organs and urinary system, etc. Q4: If the NT is thick, is it possible that there are other diseases?Ī. There are some diseases that cannot be detected by the thickness of the NT alone, such as Down’s syndrome and congenital diseases, even if the NT is normal. If the NT is normal, is there any disease?Ī. In general, it is not possible to determine illness based on the thickness of the NT alone. It is true that a thicker NT increases the possibility of Down syndrome, but there are many babies born with a 5mm or more NT who are free of the disease. Q2: Does a thick NT indicate Down syndrome? Even in normal fetuses, the NT gradually thickens as the fetus grows. Pooh will explain about “NT”, which is often heard in prenatal diagnosis, in an easy-to-understand Q & A format. 3)As you can see from the graph, babies with Down syndrome, 18 trisomy and 13 trisomy have thick NT, but there are also fetuses with trisomy with normal NT.Įven if the NT is normal, the detection rate of trisomy is close to 100% by combining various ultrasound markers such as CRIFM. The area in blue is NT positive, that is, the NT is thicker than normal. ![]() In this graph, the horizontal axis is the fetal head to buttock length (also called CRL) and the vertical axis is the size of the NT.The white line is the average NT size of a normal fetus and the red box is the normal NT range. 2)As the fetus grows, even normally, the NT also grows little by little. *Click here to learn more about NT certification. In order to accurately produce this screen, a great deal of training and experience is required, and qualified NTs from the FMF, which sets the standards for NT testing, are trained to produce this screen and are tested once a year to renew their qualification. As shown in the figure, only the head and upper thorax of the fetus must fill the screen, and the nasal apex, nasal bones, and mesencephalon must be visible on the screen. 1) To begin with, the measurement of the NT requires a high degree of accuracy and a high level of skill. I will explain the reason for this with a diagram. It is also wrong to interpret that because NT is thin, it is not a problem. For example, there are babies with Down’s syndrome or 18 trisomy whose NT is getting thinner. In other words, if the NT disappears, it does not mean that the fetus is no longer susceptible to disease. This is due to the fetus’s amazing ability to adapt, allowing the blood and lymph to circulate better in that state, even if the fetus is sick. ![]() The thick NT will disappear as the fetus grows. Learn more about CVS / Amniocentesis Is NT a sign of disease? fetal Dock is a more detailed ultrasound examination than a prenatal checkup, and it allows us to clearly see the NT in fetuses as small as 4.5-8.4 cm.įor more information, please refer to the “fetal Dock” page.Īfter the results of the early fetal Dock and a thorough explanation of the risk of chromosomal abnormalities, patients who wish to have a chorionic villus sampling (CVS) performed on the same day can have the test done by inserting a syringe into the mother’s abdomen to collect villi. To determine if NT is caused by a pathological condition, the whole body of the fetus needs to be examined.Īt CRIFM, we offer “Early fetal Dock” in the first trimester of pregnancy (11-13 weeks). How to test whether NT is pathological or not Small fetuses in the early stages often have unstable circulation and are therefore more prone to NT. Therefore, NT in a fetus in early pregnancy is not necessarily a disease. The presence or absence of NT is basically a misnomer NT is present in all normal fetuses and gradually thickens with the number of weeks. This is a physiological phenomenon in terms of bodily functions. NT is an acronym for Nuchal Translucency, which refers to the NT found in the back of the neck of babies around 11-13 weeks of pregnancy.Įven adults may have swollen feet after standing all day, or swollen face and hands the day after drinking alcohol.
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