Pernicious anemia is a type of megaloblastic anemia. Pernicious anemia is caused by disturbed absorption of Vitamin B12. Absorption of the Vitamin B12 is disturbed because the so called “intrinsic factor”, which is produced in the stomach, is missing. The Intrinsic factor becomes missing in cases of chronic atrophic gastritis. Was chronic gastritis proven in your case? Other reasons for deficit of Vitamin B12 could be: diet with less Vitamin B12, presence of intestinal parasites, intestinal disorders and genetic defects of Vitamin B12 transport and cell intake.
Every laboratory has its own referent values for Vitamin B12 level in the serum so I can’t judge about your values because you didn’t tell me the referent values for Vitamin B12 in the serum. For evaluating the anemia condition 2 parameters are very important: hemoglobin level and MCV (erythrocyte volume). You told me that the hemoglobin was fine but nothing about MCV. As long as the hemoglobin level and MCV are OK there is nothing to be worry about.
Gallbladder removal should not disturb the Vitamin B12 absorption.
Injections with Vitamin B12 should work.
You may want to consult a hematologist and gastroenterologist about your condition.
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