What is the Accuracy Rate of Down Syndrome Screening?

My wife is currently 16 weeks and 3 days pregnant. She just had a Down Syndrome screening test two days ago, with a result of one in every eight hundred. The doctor said this result was not ideal and asked if we wanted to proceed with further tests. What is the accuracy rate of the Down Syndrome screening? Do we need to undergo further testing?
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What Medications Are Available for Treating Down Syndrome?

Down Syndrome is caused by a chromosomal mutation that occurs before birth, and there is currently no specific treatment available. It is important to prevent infectious diseases and contagious illnesses, such as bacterial and viral infections, by using oral medications like vitamin B6, r-tyrosine, and folic acid to stabilize symptoms. As the baby grows older, surgical correction can be considered.
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