There was a positive correlation between IDO and age, serum phosphorus, CRP, ACR, plasma prothrombin time, activated partial prothrombin time, fibrinogen, D-dimer, hypertension, and uric acid (r = 0.3, p < 0.01; r = 0.4, p < 0.01; r = 0.3, p < 0.01; r = 0.5, p < 0.01; r = 0.3, p < 0.01; r = 0.2, p < 0.01; r = 0.4, p < 0.01; r = 0.4, p < 0.01; r = 0.2, p < 0.01; r = 0.4, p < 0.01). This evidence concerns the gene IDO1 and Hypertension.