According to the definitions of the types of HF, 2,267, 559, and 1,005 patients had HFrEF, HFmrEF, and HFpEF, respectively, and they had similar CRP levels (HFrEF: 1.78 ± 3.31 mg/dL vs. HFmrEF: 2.09 ± 3.83 mg/dL vs. HFpEF: 1.95 ± 3.70 mg/dL, P = 0.133). Here, CRP is linked to hydrops fetalis.