Figure 3From: Cobalamin deficiency resulting in a rare haematological disorder: a case report Diagnostic and therapeutic approach for cobalamin deficiency [2, 4]. Cbl (cobalamin), MMA (methylmalonate), Hcys (homocysteine), holoTC (holotranscobalaminII), PA (pernicious anaemia), n. (normal) *No clear consensus among authors to identify the grey zone (150-250 pmol/L).Back to article page