FGF2 and hydrops fetalis: The AUC value of FGF2 concentration for distinguishing patients with HF and healthy controls was 0.8693 (95% confidence interval [CI]: 0.8064–0.9322), whereas the value distinguishing patients with HF, non-HF dyspnea, and healthy controls was 0.8954 (95% CI: 0.8486–0.9420) (Fig. 2).