Vitamin D (25-Hydroxyvitamin D, 1,25-Dihydroxyvitamin D)

Analyte [material]

Vitamin D: 25-OH-D, 1,25(OH)2D3 [S/P]

Reference range, target level, or decision threshold

25-OH-D: 75-200 nmol/L (30-80 ng/mL)CW CPG

1,25(OH)2D3: 50-150 pmol/L (20-60 pg/mL)CW CPG

Interpretation of results

↑ Excessive supplementation or dietary consumption of vitamin D, excessive vitamin D hydroxylation due to granulomas or in primary hyperparathyroidism, some malignancies

↓ Inadequate vitamin D intake, decreased vitamin D hydroxylation, hypoparathyroidism, chronic renal failure