The Vitamin D3 Test measures the level of vitamin D in your blood, specifically 25-hydroxyvitamin D [25(OH)D], which is the most accurate way to assess your vitamin D status. Vitamin D3 (cholecalciferol) is essential for bone health, immune function, and overall well-being, as it helps your body absorb calcium.

• Assess Vitamin D Deficiency: Low levels of vitamin D can lead to bone disorders such as rickets in children, osteomalacia in adults, or contribute to osteoporosis.
• Monitor Treatment: If you're taking vitamin D supplements, the test can help ensure that your levels are optimal.
• Evaluate Causes of Bone Weakness: This test is often ordered when there is unexplained bone pain, muscle weakness, or a suspicion of calcium metabolism disorders.
• Assess Immune System and Chronic Conditions: Low levels of vitamin D have been associated with increased risk of chronic conditions such as cardiovascular disease, autoimmune diseases, and infections.