Vitamin D tests involve taking a blood sample to measure the vitamin D levels in your bloodstream. There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy ...
Doctors use the 25-hydroxy vitamin D test to monitor your vitamin D levels. Low levels can mean you need to spend more time outdoors or adjust your diet. But it can also occur with certain medical ...
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Vitamin D Test: Everything You Need To Know
A vitamin D test measures your blood's vitamin D levels to see if they are too high or too low. Low vitamin D levels can ...
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