Table 1 Serum alkaline phosphatase activity and calcium and phosphate concentrations according to vitamin D status
Vitamin D statusNoGA (weeks)CGA (weeks)ALP (U/l)Ca2+ (mmol/l)Phosphate (mmol/l)
Deficiency (<50 nmol/l)1627.4 (25–29)33.3 (28–43.1)1519 (1050–2653)2.56 (2.13–2.67)1.9 (0.95–2.51)
Mild deficiency (50–69 nmol/l)426.9 (26–30)34.4 (31.3–47.6)1256 (1048–1628)2.67 (2.54–2.75)2.42 (1.58–2.55)
Normal (⩾70 nmol/l)327.6 (26–28)35.1 (31–38)1196 (1089–1334)2.68 (2.64–2.72)2.46 (2.25–2.51)
  • Values are mean (range).

  • CGA, corrected gestational age at vitamin D sampling; GA, gestational age at birth.