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25-Hydroxy Vitamin D
MessageWALTER REED
Test Code
WR21
Alias/See Also
"CHOLECALCIFEROL METABOLITE
25-HYDROXYCALCIFEROL
25-OH-D
VITAMIN D3 METABOLITE
LCA 081950
25OHD-KAHC/FEVA
VITAMIN D 25 HYDROXY
25-HYDROXYVITAMIN D
680X QUEST
81950 L
25-HYDROXYCALCIFEROL
25-OH-D
VITAMIN D3 METABOLITE
LCA 081950
25OHD-KAHC/FEVA
VITAMIN D 25 HYDROXY
25-HYDROXYVITAMIN D
680X QUEST
81950 L
Preferred Specimen
serum 0.3 mL
Minimum Volume
0.15 mL
Transport Container
Plain red top/NO SST!
Limitations
"Recent studies consider the lower limit of 32.0 ng/mL to be a threshold for
optimal health."
optimal health."
Reference Range
"Deficiency < 10 ng/mL
Insufficiency 10 - 30 ng/mL
Sufficiency 30 -100 ng/mL
Toxicity >100 ng/mL "
Insufficiency 10 - 30 ng/mL
Sufficiency 30 -100 ng/mL
Toxicity >100 ng/mL "
Clinical Significance
25-OHD3 indicates both endogenous production and supplementation. 25-OHD2 is an indicator of exogenous sources, such as diet or supplementation. +Therapy is based on measurement of Total 25-OHD, with levels < 20 ng/mL indicative of Vitamin D deficiency, while levels between 20 ng/mL and 30 ng/mL suggest insufficiency. Optimal levels are > or = 30 ng/mL. Elevated bilirubin up to 10 mg/dL may lead to a 12-15% reduction in Vitamin D
