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Description
Normal serum vitamin B12 levels range between 200-900 pg/mL, with concentrations less than 200 pg/mL usually resulting in deficiency

Mechanick JI, Apovian C, Brethauer S, et al

Garvey 2013
Rats right kidneys were dissected and washed with PBS (10 mM PO43, 137 mM NaCl, and 2.7 mM KCl

This modification is thought to improve stability and cellular uptake, with the acetyl group being removed once inside cells to release active glutathione

In the rare set of patients that presents with hemolytic picture, further hemolysis workup including LDH, haptoglobin, reticulocyte count, elevated indirect bilirubin should be pursued (7)