Notably, PTH intact ECLIA level in the CKD-I group (250 ± 205.8 pg/mL) was significantly higher than that in the CKD-II group (68.9 ± 71.5 pg/mL) and control group (40.2 ± 17.7 pg/ml, p < 0.001). Here, PTH is linked to chronic kidney disease.