At-home vitamin deficiency tests are available from online retailers, including LetsGetChecked, Everlywell, MyLab Box, and more. Popular test kits can measure a person’s vitamin D, B12, or iron levels ...

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).

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 ...

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 ...

Methylmalonic acid (MMA) is a substance that is created when your body digests protein. The amount of vitamin B12 in your body controls how much MMA your body makes. A high amount of MMA typically ...

Possible Reasons, and The Best Labs for Fatigue Key Takeaways: Fatigue describes more than just feeling sleepy — it’s a ...

High doses of the vitamin biotin in a person's blood can cause errors in some medical lab tests, and these faulty test results have already been linked to one death, according to the U.S. Food and ...

Researcher says vitamin D has an effect similar to breast cancer drug. Feb. 22, 2010— -- Doctors have known that low levels of vitamin D are linked to certain kinds of cancers as well as to ...

A randomized trial from Vanderbilt-Ingram Cancer Center reveals that magnesium may be the missing key to keeping vitamin D ...

How to use an at-home vitamin deficiency test For any further questions, all reputable at-home tests will have instructions and a customer care line. Most vitamin deficiency tests require a blood ...