Screening for Urinary Tract Infection With the Yellow IRIS

The Yellow IRIS Model 450 Urinalysis Workstation (International Remote Imaging Systems) was evaluated for its ability to detect abnormalities in urine that could predict urinary tract infection (UTI) in 392 specimens. The time allowed between collection and testing was limited to 2 hours. Patients yielding specimens containing 104 or more colony forming units per milliliter (CFU/mL) with white blood cells (WBCs) present were considered to have UTI. Medical records were reviewed for clinical evidence of UTI when WBCs were absent in these specimens, and when WBCs were present, but less than 104 CFU/mL were isolated. The combination of factors that displayed optimum sensitivity and specificity was 2 WBCs or greater per HPF and/or 2 red blood cells or greater per HPF (92.8% and 60.1%, respectively).