Technical factor | Effect on RBC labeling with 99mTc |
---|---|
Too little Sn2+ ion | Amount of Sn2+ is insufficient to reduce Tc(VII) |
Too much Sn2+ ion | Reduction of Tc(VII) occurs before cell labeling |
Carrier 99Tc | Elution time is long (generator ingrowth) |
Too short an interval | Tinning cannot occur |
Exposure of 99mTc to air | 99mTc is oxidized |
Injection of 99mTc and Sn2+ through same intravenous line | 99mTc is reduced before contact with RBCs |
Improper syringe flushing (flushing with dextrose instead of saline) | 99mTc is reduced in the line |