Vitamin D (1,25-dihydroxy) - serum
Last updated: Wednesday, 31, March, 2004
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5 mL blood in a plain tube.
| Reference Interval|
Suspected abnormality of vitamin D, not affecting 25-hydroxycholecalciferol. The assay is rarely required clinically.
Normal levels of 25-hydroxycholecalciferol with increased 1,25-dihydroxycholecalciferol levels may be seen in patients with sarcoidosis and after excessive calcitriol intake.
Low levels are seen in some forms of hereditary rickets.
Rosen JF and Chesney RW. J Pediatr 1983; 103: 1-17.
Sharma OP. Curr Opin Pulm Med 2000; 6(5): 442-447.