Detection of bacteriuria and pyuria within two minutes

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Abstract
A study was performed to evaluate 2 rapid urine screening methods, Bac-T-Screen and Chemstrip LN, for their ability to screen for bacteriuria and pyuria within 2 min. A total of 1000 urine specimens was tested with the Bac-T-Screen and the Chemstrip LN and compared with a semiquantitative plate culture method. Of the 1000 specimens tested, 249 had colony counts of .gtoreq. 105 colony forming units/ml by the culture method. The Bac-T-Screen detected 94.8% (236 of 249) and the Chemstrip LN detected 84.7% (210 of 249). There were 120 pure cultures of probable pathogens of which the Bac-T-Screen detected 97.5% (117 of 120) and the Chemstrip LN detected 91.7% (110 of 120). Leukocyte counts were performed on all specimens, and both methods have the ability to detect > 10 leukocytes/mm3 in a majority (> 93%) of the specimens. The cost per test for a negative screen is approximately $1.30 for the Bac-T-Screen and $0.40 for the Chemstrip LN. Overall there is a similar negative predictive value with both methods for bacteriuria and pyuria.