PTH and chronic kidney disease: Abbreviations: CKD-MBD, Chronic Kidney Disease—Mineral and Bone Disorder; 1–84 PTH, parathyroid hormone 1–84; 25(OH)D, 25-hydroxycholecalciferol, calcidiol; 1,25(OH)2D, 1,25-dihydroxycholecalciferol, calcitriol.