...When used to screen for preeclamsia (prevalence 29.6% in the sample), the sensitivity and specificity of placental biopsy were respectively 56.8% and 87.2% (76.9% in case of intra-uterine growth retardation). When used to screen for chromosomal aberrations (prevalence 7.4%), the specificity was 14.3% and the sensitivity 93.2%...
As tests for preeclampsia go, the sensitivity and specificity of CVS are actually not too bad. They're not ideal, but considering the dearth of tests they're not worthless -- especially if you're getting CVS anyway.
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