Medically reviewed by Soma Mandal, MD A vitamin D test measures your blood’s vitamin D levels to see if they are too high or too low.Low vitamin D levels can increase your risk of bone disease and ...

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 ...

Vitamin D is essential for many bodily processes, particularly the development of healthy bones. A 25-hydroxy vitamin D test can reveal whether the vitamin D levels in a person’s blood are within a ...

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 ...

A D-dimer test measures a protein fragment that remains in the blood after blood clots break down. It can help diagnose clotting conditions such as deep vein thrombosis (DVT), pulmonary embolism (PE), ...