Vitamin D is a nutrient that is essential for healthy bones and teeth. There are two forms of vitamin D that are important for nutrition: vitamin D2 and vitamin D3. Vitamin D2 mainly comes from fortified foods like breakfast cereals, milk, and other dairy items. Vitamin D3 is made by your own body when you are exposed to sunlight. It is also found in some foods, including eggs and fatty fish, such as salmon, tuna, and mackerel.

In your bloodstream, vitamin D2 and vitamin D3 are changed into a form of vitamin D called 25 hydroxyvitamin D, also known as 25(OH)D. A vitamin D blood test measures the level of 25(OH)D in your blood. Abnormal levels of vitamin D can indicate bone disorders, nutrition problems, organ damage, or other medical conditions.

Other names: 25-hydroxyvitamin D, 25(OH)D


To determine if there is a vitamin D deficiency and to monitor the effectiveness of vitamin D supplements.


Testing should be done if you are a high risk for vitamin D deficiency or if your healthcare provider suspects that you already have a deficiency. An abnormal calcium, phosphorus, and/or parathyroid hormone level may indicate a deficiency. Testing should also be done when you have evidence of bone disease or weakness and to monitor drug treatment for osteoporosis.

    • Why do I need this test?


    • Your health care provider may have ordered a vitamin D test if you have symptoms of a vitamin D deficiency (not enough vitamin D). These symptoms include:
    • Bone weakness
    • Bone softness
    • Bone malformation (in children)
    • Fractures


    • The test may be ordered if you are at a higher risk for a vitamin D deficiency. Risk factors include:
    • Osteoporosis or other bone disorder
    • Previous gastric bypass surgery
    • Age; vitamin D deficiency is more common in older adults.
    • Obesity
    • Lack of exposure to sunlight
    • Having a darker complexion
    • Difficulty absorbing fat in your diet

  • In addition, breastfed babies may be at a higher risk if they aren't taking vitamin D supplements.
Vitamin D

Vitamin D

+$9.80 Doctor Review Fee

Note: The medical information provided here in this website is for informational purposes only and is not to be used as a substitute for professional medical advice, diagnosis or treatment.