What is a vitamin B12 test for?

A vitamin B12 test is a medical examination that measures the levels of vitamin B12 in your blood. It is primarily used to diagnose or monitor vitamin B12 deficiency or anemia. Vitamin B12 is essential for the production of healthy red blood cells, proper nerve function, and DNA synthesis. The test can help determine if you have a deficiency in vitamin B12, which can occur due to various factors such as inadequate dietary intake, malabsorption issues, or certain medical conditions.