The Prediction of Short-Term Outcome in Pregnant Women with Suspected Preeclampsia Study (PROGNOSIS) and PROGNOSIS Asia studies have previously shown that an sFlt-1/PlGF ratio of ≤38 can rule out preeclampsia within 1 week, while a ratio of >38 can rule in preeclampsia within 4 weeks (16–18). This evidence concerns the gene PGF and preeclampsia.