What is a Vitamin B12 Test?

A Vitamin B12 test measures the level of vitamin B12 in your blood. This nutrient plays a role in red blood cell production, nerve function, and DNA synthesis. The test helps diagnose deficiencies that may lead to anaemia or neurological issues.

Vitamin B12 tests are commonly requested for:

• Symptoms of deficiency such as fatigue, pale skin, memory problems, or tingling in hands and feet
• Macrocytic anaemia (enlarged red blood cells)
• Digestive disorders like Crohn’s disease or coeliac disease
• A vegan or vegetarian diet, which may lack sufficient B12
• Chronic fatigue or neurological symptoms
• Pregnancy, where B12 needs are increased