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New screening techniques for Down's syndrome are less effective than
previously supposed, despite a government initiative to offer all
pregnant women the new tests by 2004. Wellesley and colleagues (p 15)
compared the effectiveness of different screening policies and found no
evidence that the addition of serum and nuchal screening improves
antenatal detection rates or reduces rates of invasive procedures. They
say that new screening methods should be offered only as part of a
controlled study until their benefit is proved.

(Credit: CNRI/SPL)