title: Screening urine samples for the absence of urinary tract infection using the sediMAX automated microscopy analyser.
abstract: Urinalysis culminates in a workload skew within the clinical microbiology laboratory. Routine processing involves screening via manual microscopy or biochemical dipstick measurement, followed by culture for each sample. Despite this, as many as 80% of specimens are reported as negative; thus, there is vast wastage of resources and time, as well as delayed turnaround time of results as numerous negative cultures fulfil their required incubation time. Automation provides the potential for streamlining sample screening by efficiently (>30% sample exclusion) and reliably [negative predictive value (NPV) ≥ 95%] ruling out those likely to be negative, whilst also reducing resource usage and hands-on time. The present study explored this idea by using the sediMAX automated microscopy urinalysis platform. We prospectively collected and processed 1411 non-selected samples directly after routine laboratory processing. The results from this study showed multiple optimum cut-off values for microscopy. However, although optimum cut-off values permitted rule-out of 40.1% of specimens, an associated 87.5% NPV was lower than the acceptable limit of 95%. Sensitivity and specificity of leukocytes and bacteria in determining urinary tract infection was assessed by receiver operator characteristic curves with area under the curve values found to be 0.697 [95% confidence interval (CI): 0.665-0.729] and 0.587 (95% CI: 0.551-0.623), respectively. We suggested that the sediMAX was not suitable for use as a rule-out screen prior to culture and further validation work must be carried out before routine use of the analyser.
authors: Clinical Microbiology & Public Health Laboratory, Peterborough and Stamford Hospitals NHS Foundation Trust, Peterborough City Hospital, Bretton Gate, Peterborough PE3 9GZ, UK.
authors: Rosanne E
authors: RE
authors: Sterry-Blunt
authors: Clinical Microbiology & Public Health Laboratory, Peterborough and Stamford Hospitals NHS Foundation Trust, Peterborough City Hospital, Bretton Gate, Peterborough PE3 9GZ, UK.
authors: Karen
authors: K
authors: S Randall
authors: Clinical Microbiology & Public Health Laboratory, Peterborough and Stamford Hospitals NHS Foundation Trust, Peterborough City Hospital, Bretton Gate, Peterborough PE3 9GZ, UK.
authors: Michael
authors: M
authors: J Doughton
authors: PHE - Public Health Laboratory, Cambridge, Box 236, Cambridge University Hospitals NHS Foundation Trust, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0QW, UK.
authors: Sani
authors: S
authors: H Aliyu
authors: PHE - Public Health Laboratory, Cambridge, Box 236, Cambridge University Hospitals NHS Foundation Trust, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0QW, UK.
authors: David
authors: D
authors: A Enoch
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D057205:Automation, Laboratory / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008828:Microbiological Techniques / Q000379:methods*; D008853:Microscopy / Q000379:methods*; D008875:Middle Aged; D012372:ROC Curve; D012680:Sensitivity and Specificity; D014552:Urinary Tract Infections / Q000175:diagnosis*; D014556:Urine / Q000166:cytology* / Q000382:microbiology*; D055815:Young Adult