The measurement of TCN2-Cbl provides a more accurate reflection of the vitamin B12 status, particularly in the context of neurological disorders, as it specifically quantifies the fraction of Cbl bound to TCII and available for cellular uptake and metabolism [133]
The standard initial loading dose is 1,000 mcg administered intramuscularly (IM) once weekly for 4 weeks
Long term prescription of medications such as the following are likely to increase the cause of, or exacerbate the risk of B12 deficiency - the proton pump inhibitors (esomeprazole, lansoprazole, omeprazole, pantoprazole, rabeprazole), famotidine, ranitidine, metformin, glibenclamide, gliclazide, glimepiride, glipizide, sodium valproate, gabapentin, doxycycline, some oral contraceptives
Kornerup LS, Hvas CL, Abild CB (2019) Early changes in vitamin B12 uptake and biomarker status following Roux-en-Y gastric bypass and sleeve gastrectomy
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