Concentration of sST2 correlated with the degree of peripheral edema (rSpearman = 0.427, p = 0.004) and diameter of vena cava inferior (r = 0.786, p = 0.036), while biomarkers of renal function such as creatinine-based eGFR (r = −0.207, p = 0.195) and cystatin C-based eGFR (r = −0.032, p = 0.839), and established cardiac biomarkers, such as NT-proBNP (r = 0.114, p = 0.456) and troponin T (r = 0.123, p = 0.430), did not. The gene discussed is NPPB; the disease is edema.