Figure 1 Correlation between PTH level and duration of dialysis in patients with CKD. Hyperparathyroidism was observed in all patients with CKD (100%) − with a highly significant mean difference (P<0.001) compared with the control group (361.6 vs. 55.07 ng/l) − accompanied with hyperphosphatemia and increased serum creatinine with a hypocalcemic status where other laboratory findings were normal. Correlations between PTH level, patients’ data, and laboratory parameters among patients with CKD are shown in [Table 2] and Fig. 1. CKD, chronic kidney disease; PTH, parathyroid hormone.