How is a vitamin D deficiency diagnosed?

Your doctor can order a blood test to measure your levels of vitamin D. There are two types of tests that might be ordered, but the most common is the 25-hydroxyvitamin D, known as 25(OH)D for short. For the blood test, a technician will use a needle to take blood from a vein. You do not need to fast or otherwise prepare for this type of test.

What do vitamin D test results mean?

There are some differing opinions about what levels of vitamin D work the best for each person. Laboratories might use different numbers for reference. Please discuss your results with your doctor.

How often do you need to get your vitamin D levels checked?

Doctors do not usually order routine checks of vitamin D levels, but they might need to check your levels if you have certain medical conditions or risk factors for vitamin D deficiency. Sometimes vitamin D levels can be checked as a cause of symptoms such as long-lasting body aches, a history of falls or bone fractures without significant trauma.

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