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Gastric parietal cell antibodies may also be measured, though these are less specific
2 A high serum B12 value does not mean that symptoms are treated sufficiently
The NHS guidance on vitamin B12 deficiency treatment recommends a loading course of injections first, followed by regular maintenance doses
Symptomatic vitamin deficiency is more likely if the person is rendered achlorhydric (a complete absence of gastric acid secretion), which occurs more frequently with proton pump inhibitors than H 2 blockers
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