Diseases of the Blood… Vitamin B12 Levels 28 Aug 20226 Oct 2023 WHO DefinitionsVitamin B12 cut-offB12 adequacy> 221 pmol/LLow B12148 -221 pmol/LB12 deficiency< 148 pmol/L Pitfalls of Serum Vitamin B12 Neither sensitive, nor specificVitamin B12 levels mostly reflect the predominant but functionally…