25-hydroxy vitamin D3 is the storage form of vitamin D3 from which 1,25-dihydroxy vitamin D3 is synthesised. 1,25-dihydroxy vitamin D acts as a hormone and stimulates intestinal calcium/phosphate absorption and increased bone resorption.
|Replete||:|| 70-150 nmol/L
|Insufficient||:|| 40-70 nmol/L
Serum (red top)