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 ...

Vitamin D is essential for many bodily processes, particularly the development of healthy bones. A 25-hydroxy vitamin D test can reveal whether the vitamin D levels in a person’s blood are within a ...

Q: I am wondering if I should have a vitamin D blood level checked. I am healthy and think I get enough sun exposure. Why might a person like me need the test? A: The importance of sufficient vitamin ...

Vitamin D tests certified by the U.S. Centers for Disease Control and Prevention (CDC) Clinical Standardization Programs (CSP) are well calibrated overall, according to a new study presented Sunday at ...

The study, which was led by Ming-Yeh Yang and Ching-Yuan Huang of Tzu-Chi University, aimed to develop a rapid, sensitive and feasible method to determine 25(OH)D3 levels in blood for clinical ...

Two new lab tests to measure blood levels of vitamin D are inaccurate more than 40% of the time, according to a new study. Researchers say newer tests tend to overestimate the number of people who are ...

Beyond the skeletal system, vitamin D plays a role in regulating immunity, reducing inflammation, supporting nerve and muscle ...

We need vitamin D at various stages for our insulin pathways to work well, from insulin production in our pancreas to insulin resistance in our cells. So it’s no surprise that people newly diagnosed ...

When exposed to sunlight, your body manufactures vitamin D using a type of cholesterol. (Yes, even a certain amount of cholesterol is necessary for good health!) This is why vitamin D is often ...

Key Takeaways Vitamin D may help lower blood pressure in people with pre-existing high blood pressure and low vitamin D levels.  The recommended daily vitamin D intake for adults up to 70 years is 600 ...