In patients with non-hyperparathyroidism, secondary hyperparathyroidism, and tertiary hyperparathyroidism, respectively, median iPTH [IQR] was 45.00 [28.50, 52.00], 87.00 [75.20, 119.00], and 104.00 [50.25, 178.25] pg/mL; median corrected Ca [IQR] was 8.80 [8.60, 9.10], 8.80 [8.60, 9.10], and 8.80 [8.70, 8.97] mg/dL; TmP/GFR was 1.79 [1.56, 2.14], 1.43 [1.19, 1.69], and 1.65 [1.47, 1.69] mg/dL; and FGF23 level was 134.00 [88.00, 295.75], 168.00 [114.00, 427.00], and 562.50 [414.75, 1441.00] pg/mL. Here, FGF23 is linked to secondary hyperparathyroidism.