What is the optimal time for NT examination in pregnant women?

Nov 13, 2024 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Pregnant women usually undergo fetal nuchal translucency thickness examination between 11 and 14 weeks of gestation. During this period, the fetal nuchal translucency can be clearly visualized, and the measurement results are relatively accurate. Additionally, the fetal cranial ring has formed by this time, making the nuchal translucency clearly visible and relatively easy to measure.

Generally, NT refers to the nuchal translucency thickness of the fetus. Pregnant women usually undergo nuchal translucency measurement between 11 and 14 weeks of gestation. Detailed analysis is as follows:

Pregnant women typically have an NT scan between 11 and 14 weeks of pregnancy. During this period, the fetal nuchal translucency can be clearly visualized, and the measurement results are relatively accurate. At this stage, the fetal skull ring has formed, the nuchal translucency is clearly visible, and the measurement is relatively easy to perform. Conducting the nuchal translucency measurement at this time allows for a more effective assessment of the risk of fetal chromosomal abnormalities or structural malformations.

If the nuchal translucency measurement is performed before 11 weeks, the fetus is too small, and the limbs and brain have not fully differentiated, making it impossible to accurately measure NT, potentially leading to inaccurate results. After 14 weeks of gestation, the fetal lymphatic system has matured, and the nuchal translucency may gradually disappear or become less distinct. Performing the nuchal translucency measurement at this stage would lose its clinical significance and would be unable to assess the presence of fetal malformations.

When undergoing a nuchal translucency scan, the pregnant woman does not need to fast or have a full bladder. Maintaining normal eating habits and regular作息 patterns is sufficient. If the measured nuchal translucency value exceeds 3 mm, it mostly indicates a high likelihood of chromosomal abnormalities. This situation requires attention, and further examinations should be conducted under the guidance of a physician to determine the fetal condition.

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