Vitamin D Deficiency

Vitamin D Deficiency Testing and health information

You can order a blood test to measure your levels of vitamin D directly with Ulta Lab Tests. The Vitamin D, 25-Hydroxy, Total and the Vitamin D, 25-Hydroxyvitamin D (D2, D3), LC/MS/MS (QuestAssureD™) are the most common test, followed by the Vitamin D, 1,25-Dihydroxy, LC/MS/MS test.

SEE BELOW THE LIST OF TESTS FOR MORE INFORMATION ABOUT  Guide On Vitamin D Testing


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Vitamin D Testing comes in two forms when found in the bloodstream: 1,25-dihydroxyvitamin D and 25-hydroxyvitamin D. Specialists concentrate on 25-hydroxyvitamin D when testing a person’s vitamin D levels because of it’s higher concentration and longer half-life. It is responsible for the development of healthy teeth and bones.

The human body can be exposed to vitamin D in two distinct manners – endogenous and exogenous.

Endogenous sources refer to general exposure to vitamin D, such as standing in the sunlight. In contrast, exogenous sources are ingested, such as food and supplements. The sources can vary when it comes to their chemical structures, which is why they are given different names. For example, vitamin D2 (ergocalciferol) is used to highlight plant-based types.

In contrast, vitamin ... See more