A Vitamin B12 test measures the level of vitamin B12 in the blood. This essential vitamin plays a crucial role in nerve function, red blood cell production, and DNA synthesis. Low levels can lead to symptoms like fatigue, weakness, and nerve issues, while elevated levels may indicate certain health conditions. The test helps diagnose deficiencies or monitor treatment for related disorders like pernicious anemia. It is often ordered for individuals with symptoms of deficiency or those at risk due to dietary factors or medical conditions.

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