PTH and Hypoalbuminemia: Albumin demonstrated a pronounced decline in advanced CKD (G4), with a median (25, 75 percentile) of 4.0 (3.8, 4.3) g/dL, signaling hypoalbuminemia, while urea and Parathyroid hormone (PTH) levels rose as CKD progressed, with G4 patients having a median (25, 75 percentile) of 109.0 (90.0, 139.0) mg/dL and 117.0 (85.0, 194.0) pg/dL, respectively.