What is vitamin d listed as on a blood test

The 25-hydroxy vitamin D test is the most accurate way to measure how much vitamin D is in your body.

Vitamin D helps regulate calcium and phosphate levels in the body.

Usually, you will not need to fast.

But this depends on the laboratory and the testing method used. Follow any instructions for not eating before the test.

When the needle is inserted to draw blood, some people feel moderate pain.

Others feel only a prick or stinging. Afterward, there may be some throbbing.

This test is done to determine if you have too much or too little vitamin D in your blood. Screening of all adults, even when pregnant, for low vitamin D levels is generally not recommended.

However, testing may be done on people who are at high risk for vitamin D deficiency, such as those who:

• Are over the age of 65 (both skin production of vitamin D and gut absorption of vitamin D becomes lower as we get older)
• Are obese (or have lost weight from bariatric surgery)
• Are taking certain medicines, such as phenytoin
• Have osteoporosis or thin bones
• Have limited sun expos
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