Preeclampsia with FGR is severe condition which can possibly adversely affect the maternal condition. About 15% of all mothers diagnosed with FGR developed preeclampsia afterwards; therefore, those with FGR are considered to be candidates for close monitoring for the clinical manifestation of preeclampsia, and those with early-onset FGR with proteinuria may represent a high-risk group for preeclampsia.
So, if the baby's measuring small but your blood pressure is normal, just the small size is enough to push you into closer monitoring for PE. Adding proteinuria to that makes you even higher risk. The idea is that the placenta is more likely to develop hypoxia if the bloodflow is already compromised (which you can spot because the baby isn't growing well.)
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