I was fascinated to read (h/t surromoms online) about a recently-published Dutch study discussing a new test that reveals the gender of a developing fetus as early as 5 weeks' gestation and requires only a blood sample from the mother* (and, if possible the father).
Obviously, such a non-invasive test has some medical value, for example, allowing prenatal treatment of certain rare sex-linked diseases. But, by letting people know gender very early in pregnancy, it might also encourage people to terminate if they didn't get the gender they preferred.
What's your view? Do you think such a test is a good idea? Would you ask for it if you were pregnant?
*Or, I suppose (not that I really understand this stuff), more accurately, from the woman carrying the baby, since the initial screening is for Y-chromosome-associated pieces of DNA and doesn't really depend on whether the carrier is also the genetic mother. However, if the Y-chromosome markers are absent, it sounds like you need the genetic parents' DNA, because the researchers check for genetic alterations unique to the father (no Y-chromosome marker + unique paternal polymorphism = female). Also, (based, again on my limited understanding) it sounds like the blood test may not work for multiples.