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Vitamin B12 Deficiency: Recognition and Management AFP How do intrinsic factor antibodies cause falsely elevated vitamin B12 levels? Pernicious Anemia: What It Is, Causes, Signs, Symptoms, and More Osmosis Pernicious anaemia (an autoimmune disorder which results in reduced production of intrinsic factor) is the most common cause of severe vitamin B12 deficiency in the UK.
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