|ID:354 ||Vitamin D (25 OH-Vitamin D)||Search Links: General Info : Protocols : Patient Info|
|Description||25-OH vitamin D is the inactive form of vitamin D (activation requires renal hydroxylation) but is the major circulating metabolite. 25-OH vitamin D undergoes seasonal variation - higher in summer than winter.|
|Indication||Assess vitamin D deficiency in osteomalacia (adults), rickets (children) & malabsorption. Assess vitamin D toxicity in hypercalcaemia.
|Additional Info||25-OH vitamin D can also be measured by tandem mass spectrometry for research studies only. Please contact Dutty Biochemist or Pathology R&D dept.|
|Ref. Range (Male)|| |
|Ref. Range (Female)|| |
|Ref. Range (Paed)|| |
|Ref. Range Notes||In patients -< 30 nmol/L suggests vitamin D deficiency: 30-75 nmol/L suggests depletion and may be insufficient to maintain skeletal health:
> 75 nmol/L suggests vitamin D sufficiency
> 500 nmol/L suggests toxicity. Primary care and BRI-<75nmol/L is deficient or depleted, >75nmol/L is sufficient and >500nmol/L suggests toxicity.|
|IP Acute TAT||- Contact Laboratory|
|IP Routine TAT||24 hours|
|GP Acute TAT||24 hours|
|GP Routine TAT||24 hours|
|Turnround Comment||Minimum re-test interval = 28 days|
Originally edited by : JHB. Last edited on 06/09/2017 11:09:03. Published By JHB on 06/09/2016 11:09:03.