Description

Vitamin B12 testing assesses cobalamin levels vital for red blood cell formation, nerve integrity, and DNA synthesis. Deficiency may present with fatigue, paleness, numbness, memory issues, or mood changes, and can occur with vegetarian diets, pernicious anemia, or malabsorption. Treatment includes dietary adjustments and supplementation or injections. No fasting required. Methylmalonic acid or homocysteine may be added for borderline cases.