25-Hydroxyvitamin D

25-Hydroxyvitamin D, also known as calcidiol, is the main form of vitamin D circulating in your blood. It is produced in the liver from vitamin D that your body gets from sunlight exposure, food, or supplements. Measuring 25-Hydroxyvitamin D levels helps determine if you have enough vitamin D for healthy bones, immune function, and overall health. Low levels might indicate deficiency, increasing the risk of bone issues like osteoporosis, while high levels could suggest excessive intake. This test is a standard way to assess your vitamin D status and guide appropriate supplementation or lifestyle changes.