What if amniocentesis fails?

Amniocentesis is a very important prenatal diagnosis method, especially for elderly women, which should be paid more attention to. Because the incidence of fetal congenital diseases in elderly women is the highest. So what if amniocentesis fails? Is amniocentesis risky?

What if amniocentesis fails? Simply put, amniocentesis is an examination to confirm whether the baby has chromosomal diseases. The result of amniocentesis is abnormal, that is, the result of amniocentesis in pregnant women is abnormal. Mawang Encyclopedia is very sorry if the results of amniocentesis are abnormal.

At present, there is no complete method to treat chromosome diseases. Generally, the results of amniocentesis are abnormal, and doctors will advise pregnant mothers to induce labor instead of blindly repairing tires. After all, it is unacceptable for ordinary families to give birth to babies with congenital diseases in the future.

Generally speaking, the success rate of amniotic fluid cells in amniocentesis is higher than 99%. Among them, a few amniotic fluid samples were seriously polluted by the mother's blood, and the cells could not grow. In addition, due to other factors, cell chromosomes may not be obtained. At this time, amniotic fluid may be pumped again. The accuracy of chromosome results is over 99.8%. In a few cases, due to the pollution of maternal blood cells and the abnormal characteristics of chromosomes, there will be very few errors.

Generally speaking, amniocentesis is only for chromosome examination. If the result is normal, it can only show that there is no problem with chromosomes, and other diseases caused by non-chromosomes cannot be ruled out, such as most congenital heart diseases, mental retardation, cleft lip and palate, and genetic problems. In other words, even if the chromosome test results are normal, about 2% babies still find some abnormalities at birth.

Therefore, we can see that the accuracy of amniocentesis results is quite high.

Risk of amniocentesis As a prenatal diagnostic technique, amniocentesis is an invasive examination, so there are the following medical risks:

1, fine needle puncture into amniotic cavity may cause the possibility of expectant mother bleeding, hemorrhagic shock, amniotic fluid outflow, abortion and fetal injury.

2. The failure of puncture may be due to uterine malformation, placenta in the front wall, thick abdominal wall and oligohydramnios.

3. Because the in vitro culture of exfoliated cells in amniotic fluid cell culture system is influenced by many factors, such as sheep puncture time, whether the samples are mixed, culture medium pollution, etc., amniotic fluid culture may fail, and sometimes the diagnosis cannot be made because of mating.

4. Due to the limitation of existing medical technology, biochemical examination, cytology and molecular genetic analysis of amniotic fluid are sometimes difficult to diagnose and need further examination.

5. If the expectant mother has invisible infection before operation or poor sanitary conditions after operation, intrauterine infection may occur.

6. If the expectant mother is complicated with cardiovascular and cerebrovascular diseases, cardiovascular and cerebrovascular accidents may occur due to stimulation such as pain and tension.

7. Through this examination, diseases with abnormal chromosomes can be ruled out. However, due to the limitation of existing medical technology, it is sometimes difficult to distinguish some slight chromosomal abnormalities, and it is impossible to rule out some fetal malformations or abnormalities caused by polygenic diseases or other reasons.

8. The failure of amniotic fluid culture may be caused by irresistible external influences such as power failure, earthquake or damage to culture equipment.

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