Trisomy 21 is also known as Down syndrome, and a medium risk of trisomy 21 indicates a higher probability of risk of having trisomy 21, but not a confirmed diagnosis.
The risk value of trisomy 21 is mainly used to determine the risk of a fetus having trisomy 21.
However, it is only a preliminary screening for Down syndrome and does not confirm the diagnosis. An intermediate risk of trisomy 21 requires further amniocentesis or non-invasive DNA (non-invasive DNA prenatal testing technology) testing, which is used to determine the likelihood of chromosomal abnormalities in the fetus.
Due to the risk of amniocentesis, it is recommended that non-invasive DNA testing can be done first, and if the test is high risk, the diagnosis can be confirmed by doing amniocentesis.
For specific cases, you should strictly follow the doctor’s instructions and do your prenatal checkups on time.