What is the difference between non-invasive and amniocentesis? The difference is quite obvious

Many people pay special attention to the baby in their belly, so they often go to the hospital for check-up during pregnancy. Generally, the examination methods are divided into non-invasive and amniocentesis. Although they are both examination methods, there are also great differences between them, and the test results are also different. So what are the differences between non-invasive and amniocentesis?

1. Different nature

The first point is that non-invasive DNA is a prenatal test, which is also called the fetal chromosome multiple test. Therefore, it has certain scientific and technical characteristics, and it detects whether our fetus has chromosomal diseases. However, amniocentesis can mainly check the gender of the fetus, and can determine whether the fetus is male or female, so this is the biggest difference.

2. Different means and methods

The second difference is that the plans and methods they adopt are different. The non-invasive DNA test only uses the menstrual blood of the pregnant woman. In other words, it is possible to obtain the serum of pregnant women through certain medical means to achieve certain examination results and purposes, but amniocentesis does require a thin needle to pass through the pregnant woman's belly into the amniotic fluid cavity under the guidance of ultrasound. The two methods and approaches are different.

3. Different time

Furthermore, the time for non-invasive DNA testing and amniocentesis is also different. The best time for amniocentesis is after 16 weeks, because the baby is relatively small at this time, the amniotic fluid is relatively more, and the fetus floats in the amniotic fluid, which allows for a better extraction volume. However, our amniocentesis should be performed before 24 weeks, and it cannot be performed when the fetus is very small, because the concentration of non-invasive DNA is not very high when it is very small and does not meet certain standards. This is the biggest difference and distinction.