There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy vitamin D, or calcitriol. Tests will measure the amount of 25-hydroxy vitamin D in the blood. This ...

Vitamin D is one of the many essential nutrients required by the body to stay healthy. In addition to its role in bone development and maintenance, vitamin D is important for the normal functioning of ...

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 ...

WASHINGTON — Don't be surprised if your doctor orders a vitamin D test during your next physical. Blood tests to check levels of the so-called sunshine vitamin are on the rise as doctors and patients ...

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 ...

Don't be surprised if your doctor orders a vitamin D test during your next physical. Blood tests to check levels of the so-called sunshine vitamin are on the rise as doctors and patients react to ...

Some vitamin D tests may give misleading results despite progress made in recent years to improve the quality of these assays, according to the US Centers for Disease Control and Prevention (CDC).

Are we overdoing it with vitamin D tests and supplements? Katie Ward, DNP, discusses recent findings that suggest that natural sunlight and a balanced diet might just be enough to satisfy our vitamin ...

BOSTON—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 ...

It's Wellness Wednesday, and this week’s focus is on vitamin D and its role in overall health. Many people assume they’re getting enough during the summer months, but that’s not always the case. We ...