What does early pregnancy screening test do? When should early pregnancy screening be done?

My wife is pregnant and took her to the hospital for a check-up. The doctor suggested doing an early pregnancy screening. What does this early pregnancy screening check for? I don’t know anything about this. I don’t know what it means. Do this. What is the use? If you do this early pregnancy screening, when can you do it? Below I will introduce to you what the early pregnancy screening tests are and when is the appropriate time to do the early pregnancy screening. What does early pregnancy screening check?

There are two early screening tests involved during pregnancy. Usually it refers to an early Down syndrome screening done between 11 weeks and 13+6 weeks of pregnancy. It is to collect venous blood to screen for the risk of fetal neural tube defects trisomy 18 and trisomy 21. Another early screening refers to a four-dimensional or three-dimensional color ultrasound examination done between 11 and 13 plus six weeks of pregnancy to check the thickness of the fetal nuchal translucency to assess the risk of fetal disease. If the thickness of the fetal nuchal translucency is greater than 2.5 mm, the risk value should be considered high and further examination is required.

Urine test for early pregnancy screening. This examination usually starts 7-10 days after having sex. This examination is needed to determine whether the woman is pregnant. The cost of this examination is generally about 10 yuan. The examination is very simple. Generally speaking, The test results will be available immediately. If the urine test is positive, congratulations, you are about to become a mother.

B-ultrasound for early pregnancy screening. Pregnant women need to actively undergo a B-ultrasound examination after a urine test finds that they are pregnant. This examination is best done at 12 weeks of pregnancy. The B-ultrasound examination can confirm intrauterine pregnancy and rule out abnormal pregnancy.

There are two early screening tests involved during pregnancy. Usually it refers to an early Down syndrome screening done between 11 weeks and 13+6 weeks of pregnancy. It is to collect venous blood to screen for the risk of fetal neural tube defects trisomy 18 and trisomy 21. Another early screening refers to a four-dimensional or three-dimensional color ultrasound examination done between 11 and 13 plus six weeks of pregnancy to check the thickness of the fetal nuchal translucency to assess the risk of fetal disease. If the thickness of the fetal nuchal translucency is greater than 2.5 mm, the risk level should be considered high and further examination is required. When to do early pregnancy screening

The accuracy of Down syndrome screening will be different at different gestational ages. Screening in the early stage has a higher accuracy in the second trimester. The levels of alpha-fetoprotein and hormones in the serum are different. , so pay attention to the impact of gestational age, especially mid-trimester screening. Screening at 16 weeks and screening at 20 weeks may give different results. However, it is not recommended to do multiple screenings. It is completely unnecessary. If the screening is positive in the first trimester and negative in the second trimester, then the first trimester will be more accurate.

Combined screening in early pregnancy mainly uses ultrasound to detect fetal nuchal translucency thickness and maternal serology testing. Serological testing indicators include pregnancy-associated plasma protein a and free human chorionic gonadotropin. By combining serology and NT testing, the detection rate of Down syndrome is 85%, with a false positive rate of 5%. NT testing requires specialized technical training and the establishment of a good quality control system. Serology testing is performed at 10 to 13 plus six weeks of gestation, and ultrasound is performed at 11 to 13 plus 6 weeks of gestation. Screening for Down syndrome is performed at 14-20 weeks of pregnancy, and three-dimensional color ultrasound or four-dimensional color ultrasound is performed for malformation examination at 23-26 weeks of pregnancy. If the test results are all high-risk, further amniocentesis or cord blood testing should be performed. These are special examination methods during pregnancy. If there are no high-risk factors, examinations are generally not necessary. If you are elderly or have drug use experience, you need to check.

When you are 3 months pregnant, the gestational age is about 12 weeks. Generally speaking, between 11 and 14 weeks of menopause, do a color ultrasound to check the thickness of the nuchal translucency, also known as NT. This can be used to detect early, whether the fetus has Open neural tube malformation. At 16-26 weeks of pregnancy, do a Down syndrome screening to check whether there is a possibility of having a baby with Down syndrome. If there are abnormalities, non-invasive DNA should be done. If there are still abnormalities, amniocentesis is also required