Evaluation of Sysmex UF-100 urine flow cytometer vs chamber counting of supravitally stained specimens and conventional bacterial cultures
| Autor: | R. M. Rowan, K. Malminiemi, R. Vuento, T. T. Kouri, U. Kähkönen |
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| Rok vydání: | 1999 |
| Předmět: |
Pathology
medicine.medical_specialty Microbiological culture Urinalysis Bacteriuria Cell Count Urine Biology Sensitivity and Specificity Flow cytometry Chamber method Cost Savings medicine Humans Microscopy Phase-Contrast Bacteriological Techniques Autoanalysis medicine.diagnostic_test business.industry Reproducibility of Results Epithelial Cells General Medicine medicine.disease Flow Cytometry Staining Evaluation Studies as Topic Kidney Diseases Nuclear medicine business Urine flow |
| Zdroj: | American journal of clinical pathology. 112(1) |
| ISSN: | 0002-9173 |
| Popis: | We evaluated the Sysmex UF-100 urine flow cytometer (TOA Medical Electronics, Kobe, Japan) with 269 uncentrifuged urine specimens by comparing it with Sternheimer staining and particle counting in 1-microL disposable chambers with both brightfield and phase-contrast microscopy (the reference method). Results of routine test strip analysis, sediment microscopy (182 specimens), and bacterial culture (204 specimens) were also available. Detection of urinary WBCs and RBCs was highly reliable with the UF-100 compared with manual chamber counting (r = .98 and .88, respectively). Identification of bacteria was equal to that with visual microscopy of uncentrifuged specimens; sensitivity was 55%, and specificity 90%, compared with bacterial cultures at a cutoff of > 10(3) colony-forming units per milliliter. Renal damage was difficult to evaluate even with manual methods because of the low counts of renal tubular cells and casts; with standard manual Sternheimer-stained sediment analysis, sensitivity was 65% to 69% and specificity 66% to 91%, compared with the uncentrifuged chamber method at a cutoff of 3 and 10 particles per microliter, respectively. Renal damage was demonstrated with the UF-100 with a sensitivity of 26% to 69% and specificity 92% to 94%, compared with chamber counts. Automated urinalysis with the UF-100 urine flow cytometer offers considerable savings in time and labor. When high sensitivity is needed, visual microscopic review should be performed to detect renal disease. |
| Databáze: | OpenAIRE |
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