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 ...

At-home vitamin D tests may provide insights into your health. When followed by a consultation with a doctor, it can be a first step in managing a common nutritional deficiency. Vitamin D helps you ...

One of the most rapidly accelerating health trends today is direct-to-consumer lab testing, in which users pay a company for a certain test, collect their own mouth or nasal swabs, finger-prick blood ...

Rodney E. Rohde has received funding from the American Society of Clinical Pathologists, American Society for Clinical Laboratory Science, U.S. Department of Labor (OSHA), and other public and private ...