PTH and chronic kidney disease: Serum intact PTH was elevated (1020 pg/ml; normal values, 12 62 pg/ml), but her serum calcium was normal (total = 9.4 mg/dl, nv 8.5–10.5; ionized = 5.0 mg/dl, nv 4.2–5.4) due to the coexistence of chronic renal failure.