title: Detection of asymptomatic bacteriuria in obstetric patients with a semiautomated urine screen.
abstract: Urine specimens (1215) from obstetric patients were evaluated for the presence of significant bacteriuria by the Bac-T-Screen (Marion Scientific Division, Marion Laboratories, Inc., Kansas City, Missouri) and a conventional semiquantitative culture method. Seventy (5.8%) specimens were not processed successfully by the Bac-T-Screen because pigments interfered with interpretation or the test filters clogged. The remaining 1145 specimens screened by the Bac-T-Screen were compared with a conventional culture method. The sensitivity, specificity, positive predictive value, and negative predictive value for specimens containing greater than or equal to 10(5) colony-forming units per milliliter were 97.4%, 70.4%, 19.0%, and 99.7%, respectively. These values for specimens containing greater than or equal to 10(4) colony-forming units per milliliter were 92.2%, 71.6%, 24.1%, and 98.9%, respectively.
mesh_terms: D001431:Bacteriological Techniques / Q000295:instrumentation; D001437:Bacteriuria / Q000382:microbiology*; D004755:Enterobacteriaceae / Q000302:isolation & purification; D005069:Evaluation Studies as Topic; D005189:False Positive Reactions; D005260:Female; D006094:Gram-Positive Bacteria / Q000302:isolation & purification; D006801:Humans; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000382:microbiology*; D014556:Urine / Q000166:cytology