If you get the test make sure it is the right one! 25 (OH) stays in the blood longer, so this is the more accurate test. (half life of 3 weeks in your blood). M

If you get the test make sure it is the right one! 25 (OH) stays in the blood longer, so this is the more accurate test. (half life of 3 weeks in your blood). Many experts recommend a level of at least 30 ng/ml ... some actually suggest that 50 ng/ml! The scale on the test results is: Interpretive Data: Deficiency: <10 ng/mL Insufficiency: 10 to 30 ng/mL Sufficiency: 30 to 100 ng/mL Toxicity: >100 ng/mL "The majority of 25-OH vitamin D (25-D) in the circulation is derived from the conversion of 7-dehydrocholesterol in the skin that is irradiated with ultraviolet radiation in the UVB range (wavelength 290 nm to 315 nm).1-5 The extent of vitamin D formation is not tightly controlled and depends primarily on the duration and intensity of the UV irradiation. Levels produced typically reach a plateau within 30 minutes of exposure." [1] "Vitamin D insufficiency is more prevalent among African Americans (blacks) than other Americans and, in North America, most young, healthy blacks do not achieve optimal 25-hydroxyvitamin D [25(OH)D] concentrations at any time of year." [2] [1]: https://www.labcorp.com/test-menu/36721/vitamin-d-25-hydroxy# https://www.labcorp.com/test-menu/36721/vitamin-d-25-hydroxy... [2]: https://www.ncbi.nlm.nih.gov/pubmed/16549493 https://www.ncbi.nlm.nih.gov/pubmed/16549493