The best time for Tang screening examination
Tang screening is a prenatal screening method that detects chromosomal abnormalities and is usually performed in early pregnancy. So, when is the best time for Tang screening examination? How many weeks is the best time to do Tang Si? The following is a detailed discussion from the physical condition of pregnant women, testing accuracy, testing methods, interpretation of test results, etc., in order to clarify how pregnant women can choose the best time to undergo Tang screening examination.
1. Physical condition of pregnant women
The first thing to consider is the physical condition of the pregnant woman, including gestational age, maternal age, maternal and childbirth history and other factors. Generally speaking, it is recommended that pregnant women undergo a Tang screening test between the 14th and 20th weeks of pregnancy. This is because fetal chromosomal abnormalities are easier to detect during this period than before; at the same time, the body of the pregnant woman is relatively stable and cannot be easily detected. It will have a great impact on the inspection results. If the pregnant woman is of advanced age (≥35 years old), has a family genetic history, or has high risk factors such as high blood pressure and diabetes during pregnancy, it is recommended to undergo a Tang screening test early in pregnancy.
2. Detection accuracy
The accuracy of Tang screening examination is also an important factor in choosing the best time. The accuracy and precision of Tang screening will be affected by gestational age, so the accuracy of Tang screening at different gestational ages is also different. Generally speaking, if a Tang screening test is performed between 16 and 18 weeks of pregnancy, its accuracy can reach 95% to 99%. However, if Tang screening is performed after 24 weeks of pregnancy, the significance of the test is no longer significant. Therefore, pregnant women need to choose the best time for examination based on their gestational age.
3. Detection methods
There are two methods for Tang screening: maternal serological examination and ultrasound examination. Serological examination of pregnant women collects a certain amount of blood samples from pregnant women to measure endocrine hormones and interpret whether there are chromosomal abnormalities and other problems in the blood of pregnant women. Ultrasound examination is performed by doctors using ultrasound equipment to observe the growth and development of the fetus and whether the spine, neck, limbs, skull and other parts are developing normally. If the results of both methods are high, you need to pay attention to whether the fetus has chromosomal abnormalities.
4. Interpretation of inspection results
If the Tang screening test results are high-risk, further tests such as amniocentesis or chorionic villus biopsy will be needed to determine the accurate status of the pregnant woman. If the Tang screening test performed by a pregnant woman in the first trimester shows low risk, it is recommended not to worry too much about the test results, but it is still necessary to conduct a prenatal check-up before delivery to detect and deal with possible problems of the pregnant woman and the fetus in a timely manner.
Summary
Through the above analysis, we know that the best time for Tang screening examination is between 16 and 18 weeks of pregnancy. At the same time, factors such as the physical condition of the pregnant woman, the detection method, and the interpretation of the examination results need to be considered. Pregnant women can choose the best time for a Tang screening test under the guidance of a doctor to ensure the accuracy and effectiveness of the Tang screening test.
