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Serum level of 25(OH)D is the laboratory test ordered to indicate whether or not a person has vitamin D deficiency or insufficiency. [53] It is also considered reasonable to treat at-risk persons with vitamin D supplementation without checking the level of 25(OH)D in the serum, as vitamin D toxicity has only been rarely reported to occur.
The most common cause of osteomalacia is a deficiency of vitamin D, which is normally derived from sunlight exposure and, to a lesser extent, from the diet. [10] The most specific screening test for vitamin D deficiency in otherwise healthy individuals is a serum 25(OH)D level. [11]
In medical practice, a blood test for 25-hydroxy-vitamin D, 25(OH)D, is used to determine an individual's vitamin D status. [11] The name 25(OH)D refers to any combination of calcifediol (25-hydroxy-cholecalciferol), derived from vitamin D 3, and ercalcidiol (25-hydroxy-ergocalciferol), [1] derived from vitamin D 2. The first of these (also ...
A 2016 study found that vitamin D treatment significantly improved fatigue in healthy people with vitamin D deficiency. Another study suggests that vitamin D supplementation might improve fatigue ...
Additionally, they had a serum 25-hydroxy vitamin D level between 10 and 30 ng/mL. Anything below 30 ng/mL is considered insufficient, while values less than 20 are classified as vitamin D deficiency.
Serum 25(OH)D concentration is used as a biomarker for vitamin D deficiency. Units of measurement are either ng/mL or nmol/L, with one ng/mL equal to 2.5 nmol/L. There is not a consensus on defining vitamin D deficiency, insufficiency, sufficiency, or optimal for all aspects of health. [23]
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