the formation of labelled 1,25-dihydroxy-cholecalciferol [ 1,25- ( oh ) 2d3 ] and labelled 24,25-dihydroxycholecalciferol [ 24,25- ( oh ) 2d3 ] has been related to the prevailing concentrations in serum of 25-hydroxycholecalciferol [ 25- ( oh ) d3 ] , immunoreactive parathyroid hormonel , calcium and orthophosphate ( pi ) .
C0006657
25-hydroxycholecalciferol
C2713074
25