NT examination is a commonly used method for screening fetal chromosomal abnormalities. NT screening measures the thickness of the baby's nuchal translucency, and thickening of the nuchal translucency suggests that the fetus may have some congenital abnormalities. Many expectant mothers don't know which one to do first, NT or Down syndrome screening. So, should we do NT first and then Down syndrome screening?
Do NT first and then do Down syndrome screening. NT is usually checked at 11 to 14 weeks of pregnancy, while Down syndrome screening is checked at 15 to 20 weeks.
NT can be regarded as an early screening for Down syndrome, as the indicators for NT screening are also important indicators for Down syndrome fetuses.
NT mainly detects the maximum thickness of soft tissue between the skin on the baby's neck and back and the baby's fascia, which can reflect the accumulation of lymphatic fluid in the baby's subcutaneous tissue. Before 14 weeks, the baby's lymphatic system is not fully developed, so a small amount of lymphatic fluid will accumulate in the baby's neck lymphatic sac or lymphatic vessels, forming n.
NT examination can exclude some congenital abnormalities. If the NT value is greater than or equal to 2.5 millimeters, it is an abnormal phenomenon. If it is an older pregnant woman, it can be slightly relaxed.
But if the NT value is greater than or equal to 2.5 millimeters, don't worry too much. This test is only a screening and not the final diagnosis. Moreover, a high NT value this time may not necessarily be a true high, and it doesn't necessarily mean that the baby has a problem. Mothers can continue to undergo relevant prenatal examinations to confirm the baby's development.
