NEW YORK (GenomeWeb News) – Aetna this week issued a clinical policy bulletin suggesting that it may soon begin covering non-invasive prenatal DNA tests for Down syndrome.

In its bulletin, the health insurer said that it "considers measurement of cell-free nucleic acids in maternal blood … medically necessary for testing for fetal aneuploidy (trisomy 13, 18, 21) in pregnant women with single gestations," who meet any one of a set of criteria.

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While gene therapies may have high price tags, they could be cheaper than the cost of managing disease, according to MIT's Technology Review.

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In Nature this week: paternal age associated with de novo mutations in children, and more.

Nature News writes that researchers are still wrangling over the role of the p-value.