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What is this test?

The 25-hydroxyvitamin D test measures the amount of 25-hydroxyvitamin D in your blood. This form of vitamin D is produced when your body processes vitamin D from sunlight, food, or supplements. It is the best indicator of your overall vitamin D status because it reflects both vitamin D2 (ergocalciferol, from plant sources and supplements) and vitamin D3 (cholecalciferol, from sunlight and animal sources). The test uses an immunoassay method to detect and measure these compounds in your serum (blood) sample.

Why might I need this test?

Your healthcare provider may order this test if you have symptoms of vitamin D deficiency, such as bone pain, muscle weakness, or fatigue. It is also used to diagnose and monitor conditions like rickets, osteomalacia, and osteoporosis. The test helps evaluate how well your body absorbs calcium, which is essential for strong bones and teeth. Additionally, it may be ordered if you have kidney disease or malabsorption disorders, as these conditions can affect vitamin D metabolism.

How is the test performed?

A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. The blood is collected into a tube and sent to a laboratory for analysis. The procedure only takes a few minutes and is generally well-tolerated. You typically do not need to fast before this test, but follow any specific instructions your healthcare provider gives you.

Understanding your results

Results are typically reported in nanograms per milliliter (ng/mL) or nmol/L. Generally, a level of 20 ng/mL (50 nmol/L) or higher is considered adequate for most people. Levels below 20 ng/mL may indicate vitamin D deficiency, while levels below 10 ng/mL indicate severe deficiency. Levels above 150 ng/mL may suggest vitamin D toxicity. Your doctor will interpret your results based on your overall health, symptoms, and other factors.