What are the reasons for a 1:75 result in the Down syndrome screening?

Patient's question:

Now I am 17 weeks pregnant. Last week I had a Down syndrome screening, and yesterday I picked up the results from the hospital which showed a ratio of 1:75. The doctor said it was risky and recommended an amniocentesis.

Doctor's answer:

According to the results of these tests, the Down syndrome screening result is 1:75, which is quite high and should be considered high-risk. Down syndrome screening is only an indicator for risk assessment, not a definitive diagnosis of Down syndrome. Amniotic fluid DNA testing is an invasive diagnostic method, and due to its high risk, the accuracy of the test results is relatively high. It is recommended to follow the doctor's advice and undergo further tests for a definitive diagnosis.

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