PTH and hypophosphatemia: Meanwhile, his laboratory data showed normal serum alkaline phosphatase (ALP) of 41 U/L (normal: 40–150), calcium 2.16 mmol/L (2.15–2.55), parathyroid hormone (PTH) 6.6 pmol/L (1.6–7.9) but mild hypophosphatemia of 0.72 mmol/L (0.81–1.45).