Over the past few decades, the "normal" blood level of vitamin D (25-OH vitamin D) was based on the amount needed to keep PTH from becoming abnormally high. Again, PTH at high levels can cause ...

Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

More than 99% of 25(OH)D 3 in blood is bound to the vitamin D binding protein, albumin and other carriers, which can interfere with signal generation and detection. Furthermore, despite ...

New research finds that taking a daily vitamin D supplement may help lower blood pressure, especially for older adults with ...

Studies have linked low vitamin D with a higher risk of Alzheimer’s disease. However, it’s not clear whether vitamin D supplementation lowers Alzheimer’s risk. You can get vitamin D through ...

In addition, only 25 percent of people with the lowest amount of plaques were vitamin D deficient, versus 39 percent of the people with the highest number of plaques. These results suggest that ...

The Vitamin D Blood Test (25-OH Vitamin D): Who, How, When, and Where Clinically speaking, things began to change in the 1970s when the blood test for vitamin D (known as the "25-OH vitamin D ...