nt fetal nuchal translucency thickness

Some fetal abnormality screening during pregnancy is very important and is the key to ensuring the healthy and complete growth and development of the fetus. NT is a test of the "fetal nuchal translucency". In simple terms, it is to check whether the fetus is deformed by checking the thickness of the fetal neck. This is also the key to ensuring the late stage of Down syndrome screening and further pregnancy examinations. It provides data for subsequent examinations. Next, let's take a closer look at how to check NT and what important significance it has.

The NT value (neck translucency) refers to the thickness of the blood accumulation in the subcutaneous tissue behind the fetus's neck. It is an early screening for Down syndrome babies. About 75% of Down syndrome patients are correctly identified through this method. The best time for pregnant women to do NT testing is between the 11th and 14th weeks, so the results are the most accurate. When the precise measurement value is less than 2.5mm, everything is normal. When the precise measurement value was greater than 2.5 mm, the diagnosis of thickening of the nuchal translucency was confirmed.

Some normal babies also have a lot of fluid. Although 2.9mm is at the end of the normal range, nine out of ten babies with 2.5mm-3.5mm are completely normal. The thicker the posterior cervical transparent zone, the higher the risk of disease. If the thickness reaches 6mm, there will be a high risk of developing sex chromosomes, genetic inheritance and heart diseases such as Down syndrome. Fortunately, not many babies have such a thick nuchal translucency.

The degree of thickening of the cervical translucency is closely related to fetal malformations. The thicker the nuchal translucency, the higher the abnormal body structure of the fetus and the more serious the abnormality. It was found that 90% of normal fetuses had a cervical transparent layer thickness of 3mm, 10% of fetuses had abnormal cervical transparent layer thickness of 6mm, and 90% of abnormal fetuses had abnormal cervical transparent layer thickness.

From the above we know that nt is an early screening for Down syndrome babies. This test is mainly to check the thickness of the fetus's neck, which has a direct relationship with the development of sex chromosomes and the development of body shape. The thickness of the nuchal translucency should not exceed 3mm, otherwise it indicates that the fetus is likely to have incomplete growth and development and there is a risk. Therefore, this prenatal examination is very important and has great practical significance. It also provides data support for subsequent examinations.