In the AKI patients, according to Spearman test, PTH resulted as significantly correlated with sCr (p < 0.001; r = 0.67; CI: 0.604, 0.884), P (p < 0.001; r = 0.74; CI: 0.652, 0.913)) and iCa (p = 0.003; r = −0.52; CI: −0.706, −0.095), while it was not significantly correlated with tCa (p = 0.2). The gene discussed is PTH; the disease is acute kidney injury.