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ID:354 Vitamin D (25 OH-Vitamin D)
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Description25-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.
IndicationAssess vitamin D deficiency in osteomalacia (adults), rickets (children) & malabsorption. Assess vitamin D toxicity in hypercalcaemia.
Additional Info25-OH vitamin D can also be measured by tandem mass spectrometry for research studies only. Please contact Dutty Biochemist or Pathology R&D dept.
Concurrent Testsna
Dietary Requirementsna
Interpretation

DepartmentBlood Sciences
SampleBlood
TubeSerum Gel
Tube Picture
Collection ConditionsSend sample to lab immediately / in red bag.
Min. Vol1 mL
Freq.Weekly

Ref. Range (Male)
Ref. Range (Female)
Ref. Range (Paed)
Ref. Range NotesIn 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.
Unitsnmol/L
IP Acute TAT- Contact Laboratory
IP Routine TAT24 hours
GP Acute TAT24 hours
GP Routine TAT24 hours
Turnround CommentMinimum re-test interval = 28 days

Originally edited by : JHB. Review due on 06/09/2017 11:09:03. Published By JHB on 06/09/2016 11:09:03.