Abstract:umol/L (reference range <0.32 umol/L). Intrinsic factor and gastric parietal cell antibodies were detected. Conclusion Our patient had a clinical presentation consistent with B12 deficiency with an erroneously high active B12 level. Functional assays confirmed B12 deficiency, and a serological diagnosis of pernicious anaemia was made. This case illustrates the importance of not relying on any single test to exclude B12 deficiency.
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