A nurse is reinforcing teaching about pernicious anemia with a client following a total gastrectomy. Which of the following dietary supplements should the nurse include in the teaching as the treatment for pernicious anemia?

Choice A rationale Pernicious anemia after a total gastrectomy occurs because the stomach no longer produces intrinsic factor, which is essential for the absorption of vitamin B12 in the terminal ileum. Without intrinsic factor, dietary B12 cannot be absorbed regardless of oral intake, leading to megaloblastic anemia and neurological issues. Treatment requires lifelong parenteral or high-dose intranasal vitamin B12 supplementation to maintain healthy red blood cell production and nerve function in the absence of gastric tissue. Choice B rationale Folate or vitamin B9 is necessary for DNA synthesis and red blood cell formation, but it is not the primary deficiency caused by a lack of intrinsic factor. While folate deficiency can also cause megaloblastic anemia, it is typically related to dietary intake or absorption issues in the small intestine rather than a gastrectomy. Supplementing folate alone in a client with B12 deficiency can mask the hematological symptoms while allowing irreversible neurological damage to continue. Choice C rationale Iron is critical for the synthesis of hemoglobin, and iron deficiency leads to microcytic, hypochromic anemia rather than the macrocytic anemia seen in pernicious cases. While a gastrectomy can impair iron absorption due to reduced gastric acid, it is not the cause of pernicious anemia. The normal range for serum iron is approximately 60 to 170 micrograms per deciliter, and while it might be monitored, B12 remains the priority for this specific condition. Choice D rationale Vitamin C or ascorbic acid is an antioxidant that enhances the absorption of non-heme iron and supports immune function. It does not play a direct role in the pathophysiology of pernicious anemia or the absorption of vitamin B12. While a well-balanced diet including vitamin C is important for overall health post-gastrectomy, it cannot replace the missing intrinsic factor or the necessary vitamin B12 therapy required to prevent the progression of this specific hematological disorder.