Vitamin D Blood Test

The Vitamin D blood test measures the levels of 25-hydroxyvitamin D (25(OH)D) in the bloodstream. Vitamin D is a fat-soluble vitamin that is important for bone health, immune function, and other physiological processes in the body. The body can produce vitamin D when the skin is exposed to sunlight, and it can also be obtained from certain foods and supplements.

The Vitamin D blood test is used to assess vitamin D status and detect deficiencies. The normal range for 25(OH)D levels in the blood is between 30 and 100 ng/mL. Levels below 20 ng/mL are considered deficient, while levels between 20 and 30 ng/mL are considered insufficient.

Vitamin D deficiency is relatively common, especially in certain populations, such as older adults, people with dark skin, and those who live in areas with limited sunlight exposure. Symptoms of vitamin D deficiency may include bone pain, muscle weakness, fatigue, and an increased risk of fractures. Vitamin D deficiency has also been linked to an increased risk of several chronic diseases, such as osteoporosis, diabetes, and certain cancers.

The Vitamin D blood test can be used to diagnose and monitor vitamin D deficiency and to guide treatment with vitamin D supplements. Vitamin D supplements are available in various forms, including vitamin D2 and vitamin D3. Vitamin D3 is the more potent and stable form and is generally preferred for supplementation.

This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.


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