Vitamin D 25-hydroxy
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.
Investigation of vitamin D deficiency 25-hydroxy vitamin D3 and 25-hydroxy vitamin D2 concentrations to assess treatment efficacy in established vitamin D deficiency Differential diagnosis of bone disease Investigations of hyperparathyroidism secondary to chronic kidney disease
|Sample & container required||Serum (red top)|
|Sample volume||0.5 mL|
|Transport storage||For referred samples:
Stable at 2-8°C for 72 hours. Please freeze pending dispatch for analysis.
Sample can be sent by first class post.
|Turnaround time||1 week|
Grossly haemolysed samples are unsuitable for this assay.