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What Is the Normal Range for Vitamin D in a Blood Test?

author image Sharon Smith
Sharon Smith is a Certified Health Education Specialist and professional writer. She received a Masters of Science in public health in 2010 and minored in English communications as an undergraduate student. Her specialties include behavior change, weight management and whole health.
What Is the Normal Range for Vitamin D in a Blood Test?
Blood samples. Photo Credit: Alexander Raths/iStock/Getty Images

Your body uses vitamin D for maintaining healthy bones and effectively absorbing calcium. Not having enough vitamin D in your system may raise your risk of osteoporosis, bone malformations, cancer, inflammation and suppressed immunity. A simple blood test can give you accurate results and help you determine if your vitamin D levels are in the healthy range.

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The Test

Your body has different forms of vitamin D. The National Institutes of Health reports that the 25-hydroxy vitamin D test is the most accurate measuring tool for determining whether you have enough vitamin D in your system. According to the Institute of Medicine, the optimum range of 25-hydroxy vitamin D in the blood is 20 to 50 nanograms per milliliter, abbreviated ng/mL. Less than 20 ng/mL is inadequate, but more than 50 ng/mL may also put your health at risk. Discuss your results with your doctor if you have any concerns about your vitamin D level.

Good Nutrition

The Institute of Medicine recommends 600 international units, or IU, per day of dietary vitamin D for adults through age 70 and 800 IU per day thereafter. You can get vitamin D three ways: sun exposure, the food you eat and supplements. Sun exposure can be problematic because of the associated risk of skin cancer. Vitamin D-fortified, low-fat milk and dairy products, tuna, salmon and eggs are good sources of this important nutrient.

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