The normal range of vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. The examples above are common measurements for results of these tests.
Normal value ranges may vary slightly among different laboratories. Some laboratories use different measurements or test different samples. Many people are confused by the way these tests are reported.
How The Test Is Performed
Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL. The examples above are common measurements for results of these tests.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results, and whether you may need vitamin D supplements. Many people are confused by the way these tests are reporte.
Symptoms And Health Risks Of Vitamin D Deficiency
What Is A 25-Hydroxy Vitamin D Test?
It is also present in some foods, such as oily fish and egg yolk. Vitamin D performs several important roles throughout the body. For example, it helps the body absorb calcium to maintain bone health.
It also supports the function of muscles and nerves. A 25-hydroxy vitamin D test measures vitamin D levels in the body.
Reference Range
This can be useful in studies evaluating the contribution of vitamin D2 and D3 to overall vitamin D status.
25-hydroxyvitamin D (25(OH)D) is the major circulating form of vitamin D; thus, the total serum 25(OH)D level is currently considered the best indicator of vitamin D supply to the body from cutaneous synthesis and nutritional intake. One exception is that 25(OH)D levels do not indicate clinical vitamin D status in patients with chronic renal failure or type 1 vitamin D-dependent rickets or when calcitriol (1,25-dihydroxyvitamin D) is used as a supplement.