Educational infographic showing Vitamin B12 (Cobalamin) test, highlighting its importance for red blood cell formation, nerve health, and DNA synthesis, along with common deficiency signs like fatigue, numbness, and mouth ulcers.

Vitamin B12 (Cobalamin) Test – Normal Range, Function, and Deficiency Symptoms

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Vitamin B12 (Cobalamin) is essential for red blood cell formation, nerve health, and DNA synthesis. Learn about the Vitamin B12 blood test, its normal range (200–900 pg/mL), deficiency causes, symptoms, and test preparation.

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