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Why is the UE3 level low in Down syndrome screening?

Nov 08, 2024 Source: Cainiu Health
Dr. Zhang Lu
Introduction
Under normal circumstances, the reasons for low UE3 levels in Down syndrome screening may include maternal age, maternal weight, chromosomal genetics, fetal structural abnormalities, and Down syndrome. If discomfort symptoms occur, it is recommended to seek medical attention promptly and undergo targeted treatment under a doctor's guidance. Low UE3 levels in Down syndrome screening is a test result that requires attention, but pregnant women should not become overly anxious.

Generally, "Tang screen" refers to Down syndrome screening, and UE3 refers to unconjugated estriol. During Down syndrome screening, low levels of unconjugated estriol may be caused by maternal age, maternal weight, chromosomal genetics, fetal structural malformations, or Down syndrome. If discomfort occurs, it is recommended to seek medical attention promptly and undergo targeted treatment under a doctor's guidance. Detailed explanations are as follows:

1. Maternal Age

As maternal age increases, the risk of fetal Down syndrome also rises. Advanced maternal age may lead to low unconjugated estriol levels during Down syndrome screening, which is usually associated with declining ovarian function.

2. Maternal Weight

Maternal weight is an important factor affecting the results of Down syndrome screening. Overweight pregnant women may show low unconjugated estriol levels during screening, which may be related to changes in hormone levels in the body.

3. Chromosomal Genetics

If the pregnant woman or either parent has chromosomal abnormalities, it may affect the quality of the fertilized egg and result in low unconjugated estriol levels during Down syndrome screening.

4. Fetal Structural Malformations

If the fetus has structural malformations, it may also lead to low UE3 levels in Down syndrome screening. This may be due to the malformations affecting fetal growth and development, thereby impairing the placenta's ability to secrete unconjugated estriol.

5. Down Syndrome

Down syndrome is one of the primary conditions targeted by Down syndrome screening. If the fetus has Down syndrome, the level of unconjugated estriol is typically low during screening.

Pregnant women should maintain a healthy lifestyle during pregnancy, avoid exposure to harmful substances, and attend prenatal checkups regularly to ensure fetal health.

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