Causes of Reduced RBC Labeling Efficiency
| Cause | Drug or process |
|---|---|
| Complex formation with 99mTc | Dextrose |
| Decreased RBC labeling | Digoxin |
| Prazosin | |
| Propranolol | |
| Formation of RBC antibodies | Immune disorders |
| Leukemia and lymphoma | |
| Methyldopa | |
| Penicillin | |
| Prior transfusion or transplantation | |
| Prior transfusion or transplantation | Excess stannous chloride |
| Insufficient stannous chloride | |
| Oxidation or reduction of availability of stannous ion | Cyclosporin |
| Decreased hematocrit | |
| Heparin | |
| Hydralazine | |
| Mechanism unknown | Calcium channel blockers |
| Dipyridamole | |
| Doxorubicin | |
| Iodinated contrast | |
| Metronidazole | |
| Quinidine | |
| Ranitidine | |
| Sickle-cell disease | |
| Thalassemia |