Do pregnant women need to hold their urine during NT?

At different stages of pregnancy, pregnant women need to undergo different prenatal examinations, and the results of these prenatal examinations will also be different. For example, the NT test is a prenatal examination that every pregnant woman will undergo when she is around 16 to 24 weeks pregnant, because this test can effectively detect whether the fetus has chromosomal abnormalities. But do pregnant women need to hold their urine when doing an NT test?

Do I need to hold my urine during NT during pregnancy?

NT (nuchal translucency scan) examination is a B-ultrasound examination item. It does not require blood tests. Pregnant mothers do not need special preparation for the NT examination. Eating and drinking will not affect the test results, so you can eat breakfast. Because it is an abdominal color ultrasound examination, there is no need to hold urine.

Nt Inspection Notes

1. During ultrasound examination, the crown-rump length (CRL) and biparietal diameter of the fetus are first measured to determine the ultrasound gestational age. Then the fetal structure is checked in sequence, and some important indicators such as fetal heart rate, fetal movement, the connection between the umbilical cord and the fetus, the development of the fetal limbs, and the intracranial choroid plexus are observed to exclude fetal abnormalities such as holoprosencephaly, choroid plexus cysts, umbilical hernias, and other developmental abnormalities.

2. The thickness of the nuchal translucency is measured in the sagittal section of the fetal long axis, with the fetal head and spine in a straight line during measurement. Adjust the magnification so that the fetal body occupies about 3/4 of the screen size. The measurement point is placed at the inner edge of two high-echo lines for measurement. These two high-echo lines represent the skin echo and the soft tissue echo on the spine surface respectively, and the part between them is the nuchal translucency.

3. Take a sagittal section of the fetal long axis, with the fetus in a naturally flexed position, and measure the thickest part of the subcutaneous echo-free transparent layer in the fetal neck, from the inner edge of the skin layer to the outer edge of the fascia layer. Measure three times and take the thickest value.

4. If the thickness of the fetal nuchal translucency is measured to be ≥3mm (or ≥2.5mm and the gestational age calculated based on the fetal crown-rump length is <12 weeks), the pregnant woman is recommended to undergo amniocentesis or chorionic villus sampling for fetal chromosome karyotype analysis.