Abstract

Context: Hypophosphataemia after administration of ferric carboxymaltose (FeCXM), secondary to excessive urinary phosphate loss mediated by the fibroblastic growth factor 23 (FGF23), is generally asymptomatic, except when the deficiency is very severe. Case Description: A female patient undergoing bariatric surgery experienced, at an early stage vitamin D deficiency with secondary hyperparathyroidism, and, ten and thirteen years after, develop two episodes of severe ferropenia, for which she was administered FeCXM. In both cases develop severe hypophosphatemia coursing in a completely asymptomatic. Conclusion: Unless there is already a previous depletion of phosphorus, hypophosphataemia secondary to FeCXM should not be an obstacle to future administrations. Reusing FeCXM should only be performed when phosphatemia values have recovered.

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