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About Vitamin D

Vitamin D is a fat-soluble vitamin that is made by the body after exposure to ultraviolet rays from the sun. Vitamin D can also be obtained by taking supplements and from eating certain foods.

What does Vitamin D do in the body?
Vitamin D helps maintain normal blood levels of calcium and phosphorous. It aids in the absorption of calcium, helping to form and maintain strong bones. Vitamin D also modulates neuromuscular, immune and other cellular functions.

Why do physicians test for Vitamin D?
A physician generally will order a test to determine the level of vitamin D in a patient's body.

Several factors are associated with an increased risk of developing Vitamin D deficiency.

At risk populations include:

About the test


What does Vitamin D testing assess?
Vitamin D tests generally assess the total volume of 25-Hydroxyvitamin D (25OHD), which is the form of Vitamin D circulating in the blood. Vitamin D tests may also provide information on the levels of Vitamin D2 and D3, which comprise total Vitamin D levels

Use: Rule out vitamin D deficiency

Limitations: Values of vitamin D vary with exposure to sunlight. The assay measures other vitamin D metabolites, including dihydroxylated metabolites such as 24,25, 25,26, and 1,25 dihydroxy vitamin D; however, since the physiological concentrations of these metabolites are insignificant compared to those of 25-hydroxy vitamin D, the accuracy in assessing vitamin D levels is not compromised.

Cost:  $159

Result time: 1-2 business days