...There is a significant relationship between first-trimester uterine artery Doppler RI and the subsequent development of SGA. The sensitivity of first-trimester uterine artery Doppler is greater for SGA with pre-eclampsia than it is for IUGR alone. This could be because these two entities may have different underlying placental abnormalities that are detected variably on first-trimester uterine artery Doppler evaluation...
Really, you can translate this as: "The math, it is hard." We can pick out people who could be described as reasonably likely to get sick, with things, but picking out the ones who are *definitely going to have SGA babies with PE* is easier than picking out the ones who *are going to have IUGR babies* and even so it's not all that easy -- they can pick out around 2/3rds of 'em. Which means it's sort of a screening test, sort of.
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