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Diagnosis of elevated vitamin B12 begins with serum B12 measurement, typically performed as part of routine blood tests or when investigating anaemia, neurological symptoms, or other clinical concerns
The most common cause in the UK is pernicious anaemia, an autoimmune condition preventing B12 absorption
In this case, you may not feel any overt symptoms, but you can still have elevated homocysteine or methylmalonic acid levels in your body
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