LRG1 and hydrops fetalis: The protein peptides for LRG1, which contributed most significantly to model performance, were significantly associated with future new onset HF in the non‐HF cohort [Peptide 1: odds ratio (OR) 2.345 95% confidence interval (CI) (1.456–3.775) P = 0.000; peptide 2: OR 2.264 95% CI (1.422–3.605), P = 0.001].