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A vitamin D blood test is a type of test that measures the levels of vitamin D in the blood. Vitamin D is a fat-soluble vitamin that is essential for many important functions in the body, such as maintaining strong bones, regulating the immune system, and controlling the levels of calcium and phosphorus in the blood. This test is commonly ordered when a person has symptoms that may be caused by a deficiency of vitamin D, such as weak bones, muscle weakness, and fatigue. It can also be used to monitor the effectiveness of treatment for these conditions. Vitamin D deficiency is common, especially in older adults, people who have limited exposure to sunlight, and those with dark skin.
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.
