doctor's data erythrocyte glutathione test Frontiers Glutathione reductase - Wikipedia

Its structure glycinehistidinelysine complexed with a Cu ion gives the compound its characteristic blue colouration and has made it one of the most extensively studied peptides in dermatological and biochemical research over the past four decades

Liu L, Yu Y, He J, Guo L, Li H, Teng J

The diagnosis of Vitamin B12 deficiency should be considered in patients with thrombocytopenia, specially when other blood issues are present. Bone Marrow Examination Findings In some cases, a bone marrow examination is done

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For example, anemia or low iron levels can skew the MCV test, leading one to believe that they arent deficient in Vitamin B12 when they actually are