A Vitamin B12 test, also called a cobalamin test, measures the level of vitamin B12 in your blood to detect deficiencies that may cause fatigue, tingling, or anemia.
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A small blood sample is drawn from a vein in your arm. Fasting is usually not required.
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Low levels may indicate a deficiency due to poor absorption, pernicious anemia, or a vegan diet.
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Typically between 200 and 900 picograms per milliliter (pg/mL), though values may vary by lab.
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If you experience fatigue, numbness, tingling, or memory issues, or if you're at risk due to age, diet, or medical conditions.
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The test helps track the effectiveness of B12 supplements or injections in those with a diagnosed deficiency.
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A Vitamin B12 test is a simple yet important diagnostic tool for detecting deficiencies that can impact energy levels, nerve health, and overall well-being.
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