A Vitamin B12 test measures the level of Vitamin B12 (cobalamin) in your blood. This vitamin is essential for nerve function, red blood cell production, and DNA synthesis. Low levels can lead to anemia, neurological issues, and fatigue.

Why is it Done?

Doctors may recommend a Vitamin B12 test if you have:
✅ Symptoms of deficiency (fatigue, weakness, numbness, memory issues)
✅ Certain conditions (pernicious anemia, digestive disorders)
✅ A vegan or vegetarian diet (since B12 is mostly in animal products)

How is it Done?

• A blood sample is taken, usually from a vein in your arm.
• No fasting is usually needed, but some doctors may ask you to avoid food for a few hours.

Normal Range

• Generally, 200–900 pg/mL (varies by lab)
• Below 200 pg/mL may indicate deficiency
• High levels could suggest liver disease, leukemia, or excessive supplementation