Persistent Binding of Tc-99m Pertechnetate to Erythrocytes in a Patient Receiving Multiple Pharmaceuticals

Abstract

In a 50-year-old man, an attempt to visualize the thyroid using intravenous Tc-99m pertechnetate produced a blood-pool scan. The same finding was noted when the study was tried again 7 days later. The thyroid was functional, as shown by accumulation of I-123 sodium iodide. The patient was taking a “polypharmacy” of medications, which may have facilitated binding of Tc-99m pertechnetate to erythrocytes. FIGURE 1

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