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Most recently, a meta-analysis of 56 previously published articles concludes that second-trimester ultrasound is not a "practical screening test for Down syndrome." The study in fact states that, for some women using ultrasound as a primary determinant, amnio-related miscarriage risks are higher than is the risk of having a child with Down syndrome.
Is ultrasound entirely useless as a screen for Down syndrome? According to the study published in the February 28, 2001 Journal of the American Medical Association, second-trimester ultrasound is reliable enough to justify an amnio when all of the following are present:
It should be noted that CVS and amnio are the only means available at this time to definitely exclude or diagnose the presence of Down syndrome, and that both are used to detect several other chromosomal anomalies as well.
For many, the question of prenatal testing is moot, and in fact, some choose not to engage in any such testing. For the rest, living with the anxiety surrounding diagnostic blood draws, needle aspirations, and sonograms is just another part of the pregnancy experience. Understanding the tests themselves and the risks involved can help one make big decisions, but can also add to your anxiety. Talking with others who've gone through what you are may soothe your nerves.
© Tracy Morris
