Hypophosphatemia associated with paraproteinemia: a case report and review of the literature.

The differential diagnosis for hypophosphatemia is long, and involves complex, overlapping physiological systems. Practitioners are often guilty, however, of simply supplementing phosphate without fully investigating the etiology of the problem. The purpose of this case presentation is to illustrate a case of spurious hypophosphatemia that initially led to unnecessary phosphate replacement in a woman with undiagnosed multiple myeloma.