Vitamin D is necessary for your body as it helps your body to absorb calcium. As a result of which calcium keeps your bones healthy. When the sun's UC rays come in contact with your skin, it converts it into Vitmain D which occurs in the liver. This is followed by the second stage of converting that vitamin into a chemical known as hydroxyvitamin D which is also known as calcidiol.
The name of the test 25-Oh Vitamin D indicates that the amount of 25 hydroxyvitamin D present in your blood.
Doctors prescribe this test for various reasons:
Individuals not receiving enough sunlight.
Older individuals above 50.
Individuals who are suffering from obesity.
Infants only receiving breastmilk.
Individuals who had undergone gastric bypass surgery.