Phosphate , calcium , and intact PTH levels were measured every 2 weeks for 12 weeks and vitamin D doses were changed according to target ranges of phosphate ( 3.5 - 6.0 mg/dL ) , calcium ( albuminadjusted calcium : 8.4 - 10.0 mg/dL ) , and intact parathyroid hormone ( 60 - 180 pg/mL ) .