Vitamin D (25-OH) Test

The vitamin D (25-hydroxy) test, also known as the 25-hydroxyvitamin D test, is a blood test that measures the levels of 25-hydroxyvitamin D in the bloodstream. Vitamin D is a crucial nutrient that plays a vital role in maintaining bone health, supporting the immune system, and regulating various physiological processes in the body. This test is commonly used to assess vitamin D status and diagnose vitamin D deficiency or insufficiency. Low levels of vitamin D can lead to weakened bones, increased risk of fractures, muscle weakness, and other health issues. This test is often ordered for individuals with symptoms of bone pain, muscle weakness, and fatigue, or those at risk of vitamin D deficiency, such as older adults, people with limited sun exposure, or those with certain medical conditions.