Tang's screening test is a disease test to be performed after the birth of a newborn. Through the test, you can determine whether the child is a Tang poem! Is your body healthy? There are many precautions in the examination process of Down's screening that are unknown to expectant mothers. The best time for Down's screening is nine weeks or 14 weeks of pregnancy, also known as early pregnancy screening. So does early Down's screening require an empty stomach? What are the precautions!
Does Down's screening require an empty stomach? It is believed that this is a problem that many expectant mothers who have their first baby doubt. As one of the pregnancy examination items, Down's screening, we need to have a good understanding of this problem.
1. Examination time of Down's screening
The best time for screening is the 9th to 14th week of pregnancy, which is called early pregnancy screening. If you miss this time, you need to enter the middle pregnancy screening. Although risk calculation can also be carried out, if the final diagnosis result is positive, it will cause greater damage to the mother.
In the early and middle stages, pregnant women can get the screening results within one week after blood drawing. If the results are high risk, there is no need to panic, because further diagnosis can be made only through villus biopsy (early stage), amniocentesis and fetal chromosome examination (middle stage).
2. Precautions for Down Screening
During Down's screening, the patient fasted after 12 o'clock the night before and came to the hospital the next morning on an empty stomach for examination.
In addition, the examination is also related to month * period, weight, height, accurate gestational week and gestational age. It is better to consult the doctor about other preparations before the examination. Screening includes taking maternal serum and detecting pregnancy related plasma protein A (PAPP-A), free hCGB subunit (two in the early stage) or alpha fetoprotein (AFP), chorionic gonadotropin (HCG) and free estriol (uE3) (three in the middle stage) in maternal serum.
The risk coefficient of "Down's baby" can be calculated based on the expected date of delivery, weight, age and gestational week of the pregnant woman at the time of blood collection, so that 80% of the Down's baby can be found.
During prenatal screening, pregnant women need to provide more detailed personal data, including birth date, last month *, weight, whether insulin dependent diabetes, twins, whether smoking, abnormal pregnancy history, etc. Since the risk rate statistics of screening need to be adjusted according to the above factors, it is also very important to fill in the test sheet before blood sampling.
3. How to see the results of Down's screening
At present, the Tang screen test is to test the concentration of alpha fetoprotein (AFP) and human chorionic gonadal hormone (β - hCG) in the blood of pregnant women, and use computers to accurately calculate the risk of each pregnant woman carrying a Down's fetus in combination with the age of pregnant women.
Alpha fetoprotein (AFP) generally ranges from 0.7-2.5MOM.
The higher the level of chorionic gonadotropin, the higher the chance of Down's disease. In addition, the doctor will input the alpha fetoprotein value, chorionic gonadotropin value, and the age, weight, and weeks of pregnancy of the pregnant woman into the computer.
The computer calculates the risk of Down's disease in the fetus. The standards used by different hospitals are different. If the probability indicated in the test results (such as 1/100) is greater than the probability of the normal reference value (such as 1/275), the result is positive, indicating that the fetus has a high risk of disease. Further amniocentesis or chorionic villus examination should be performed.
Is fasting necessary for early Down's screening? Maybe most expectant mothers don't know about it because they have no experience in their first pregnancy. Here we suggest that everyone should not eat water, fruit and other food after 12 o'clock before the examination. They can only eat it after the examination. The screening results will change.
