Gallium-67 imaging to localize urinary-tract infections.

To differeniate upper from lower-tract urinary infections, 73 patients were imaged with 67Ga citrate. Renal uptake of the radioisotope occurred in pyelonephritis (documented in 47 patients by ureteral cathieterization, bladder washout, or histology) with an accuracy of 86%. There were 15% false-positives and 13% false-negatives. 67Ga may prove to be a clinically valuable test in the diagnosis of pyelonephritis. Results are promptly available 24 hours after injection, and it is non-invasive test that can safely be repeated to follow recurrent infections.