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 ...

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 ...

Vitamin D requires magnesium to become active, crucial for bone health, immune function, and mood regulation. Avocados are a notable magnesium source, ...

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 ...