AdvertisementA new kind of blood test can screen for many cancers — as some pregnant people learnPlay06:49Download AudioDecember 23, 2022Nell GreenfieldboycefacebookEmailWhen women get a blood test during pregnancy that looks at free-floating DNA, they expect it to tell about the health of the fetus. But the test sometimes finds signs of cancer in the mother. (Isabel Seliger for NPR)
