In patients with mild HF, elevated serum levels of galectin 3 were negatively correlated with serum copeptin levels (ρ = −0.32, p = 0.0078) and also hemoglobin (ρ = −0.29, p = 0.0154) and positively correlated with BMI (ρ = 0.46, p = 0.0001). This evidence concerns the gene LGALS3 and hydrops fetalis.