The concentrations of urea (p < 0.001), creatinine (p < 0.001), uric acid (p = 0.029), β2-macroglobulin (p < 0.001), potassium (p < 0.001), phosphates (p = 0.018), and parathyroid hormone (p < 0.001) were significantly higher in HD patients compared to patients with CKD stage 3–4. Here, PTH is linked to chronic kidney disease.