How long does it take to notify if the amniocentesis is abnormal?

Amniocentesis can detect whether the baby has a genetic disease by extracting the amniotic fluid of the pregnant woman. In particular, the fetuses of older pregnant women are prone to genetic diseases such as trisomy 21 syndrome. Therefore, the doctor will recommend whether the pregnant woman needs to undergo amniocentesis and other prenatal examinations based on the specific situation. So, how long does it take to inform pregnant women if an abnormality is found in amniocentesis?

How long does it take to notify if an abnormality is found in amniocentesis?

Abnormal results of amniocentesis will generally be announced early. There are generally two result announcements for amniocentesis, the basic result and the final result. The basic results are mainly to check whether there are any abnormalities in the fetal chromosomes. The success rate is 70%-80%. The results are usually available in about a week. If there are any abnormalities, you will usually be notified by phone. Some hospitals will inform pregnant women whether everything is normal or not. The final results are usually available 2-3 weeks after the operation, and the success rate of chromosome abnormality detection is over 99%.

Generally speaking, if the results of amniocentesis are abnormal, the doctor will suggest that the pregnant woman do genetic counseling to obtain more information. Usually, the sex chromosomes of the fetus will be compared with those of the prospective parents. If the genes are inherited from the parents and will not seriously endanger life, the woman can continue to become pregnant. If there are other situations, the pregnant woman will be recommended to undergo induced abortion, because sex chromosome diseases cannot be completely cured in modern times.

The fetus has abnormalities in sex chromosomes, most commonly trisomy 18, 13, and 21, or sex chromosome abnormalities, which are usually abnormalities in the number and structure of sex chromosomes caused by genetic inheritance or environmental factors.

1. Abnormality of chromosome 21: One extra chromosome in the 21st pair means Down syndrome, which means the newborn is born with congenital idiocy. The condition of children in this condition is more serious than cerebral palsy, and the chance of recovery is zero. Moreover, the treatment and care after birth are too heavy a burden for most families. Therefore, induced abortion is usually recommended.

2. Abnormality of chromosome 13: The most common one is trisomy 13 syndrome, which is the second most common autosomal disease. Its prevalence in newborns is 1/(4000~10000), and the incidence in women is significantly higher than that in men. The incidence increases with the age of the pregnant mother. The main characteristics of this disease are severe low intelligence, unusual appearance, limb and reproductive diseases, and may be accompanied by serious fatal deformities. 90% of patients die within one year old, so abortion is the best option.

3. Abnormality of chromosome 18: The most common one is trisomy 18 syndrome, which is the second most common clinical symptom of chromosome trisomy after congenital idiocy. The main malformations of trisomy 18 syndrome include bones, urinary system, and heart. In addition, abnormalities may also occur in the skin folds, skin ridges, hair, lungs, and kidneys.