PTH and chronic kidney disease: They reiterate the 2006 recommendations and suggest keeping PTH levels upto 2-3 fold the upper limit of normal in children on dialysis (120-180 pg/mL).Currently, some authors suggest for children with CKD stages 2-3, PTH levels 1 to 2fold the upper limit of normal, and for children in stages 4-5D, values 1.7 to 5fold the limit of normal.