Vitamin B12 (Cyanocobalamine),Serum

Vitamin B12 is crucial for healthy red blood cells, brain function, energy production, and nerves. We can't make it ourselves and vegetarians are especially at risk for deficiency since it's found mainly in animal products. A vitamin B12 test measures the amount of this essential vitamin in your blood. This test helps doctors diagnose a B12 deficiency caused by dietary factors or absorption problems and determine if further tests or treatments like B12 supplements are needed.