Urine particle evaluation: A comparison between the UF-1000i and quantitative microscopy

Service of Laboratory Medicine, Department of Clinical Pathology, Ospedale Civile, Monselice, Padua, Italy.
Clinical Chemistry and Laboratory Medicine (Impact Factor: 2.71). 08/2010; 48(8):1107-11. DOI: 10.1515/CCLM.2010.233
Source: PubMed


The study of urine particles plays a key role in the diagnosis of kidney diseases. In this study, the authors evaluated the correlation between the UF-1000i and quantitative manual microscopy.
A total of 214 untreated urine samples were studied using the Sysmex UF-1000i and compared with results obtained from quantitative manual microscopy using the Fuchs-Rosenthal counting chamber.
Using Pearson statistics, we observed satisfactory correlation between the UF-1000i and quantitative microscopy: for red blood cells (RBCs) r was 0.98, for white blood cells (WBCs) r was 1.00, for epithelial cells (EC) r was 0.96, and for casts r was 0.69. Using linear regression statistics, we also observed satisfactory correlation between the UF-1000i and quantitative microscopy: for RBCs R(2) was 0.95, for WBCs R(2) was 0.99, for EC R(2) was 0.92, and for casts R(2) was 0.48.
In our experience, automated urine particle analysis performed using the Sysmex UF-1000i analyzer is sufficiently precise and improves the workflow in a routine laboratory. Precision was satisfactory and concordance with the reference method is good for RBC, WBC and EC; for casts microscopic observation is required for flagged samples to discriminate hyaline from pathologic casts.

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    • "Some strategies, including identification of leukocytes in spun FVU or urinary leukocyte esterase testing of unspun FVU prior to detection of C. trachomatis, have been attempted [18]. Automated quantitative urine particle analyzers can test a large number of urine specimens rapidly, and their greater precision has been emphasized compared to that of microscopic examinations [19] [20]. "
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    ABSTRACT: Chlamydia trachomatis causes acute non-gonococcal urethritis, but some infected men are asymptomatic. We examined leukocytes in uncentrifuged first-voided urine (FVU) from asymptomatic men at high risk for chlamydial infection by automated urine particle analyzers to assess whether the quantification of urinary leukocytes could predict chlamydial infection in these men. We enrolled 209 asymptomatic men, whose female sexual partners had been diagnosed as having a genital chlamydial infection. Their FVU specimens were examined for quantification of leukocytes with automated urine particle analyzers and tested for Neisseria gonorrhoeae, C. trachomatis, Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma parvum, and Ureaplasma urealyticum by nucleotide acid amplification tests. Eleven men positive for N. gonorrhoeae or M. genitalium were excluded from further analysis. In the remaining 198 men, 84 positive for C. trachomatis (42.4%) had 1.8–1666.9 white blood cells (WBCs)/μl (median, 43.3 WBCs/μl) in their FVU, whereas 114 negative for C. trachomatis had 0.1–1378 WBCs/μl (median, 4.8 WBCs/μl). A receiver operating characteristic (ROC) curve was constructed to examine the sensitivity and specificity of leukocytes counts for predicting chlamydial infection. A cut-off point of leukocyte counts of 12.5 WBCs/μl was determined from the ROC curve, resulting in a sensitivity of 86.9% and specificity of 88.6% for predicting chlamydial infection. Leukocyte quantification in FVU by automated urine particle analyzers showed good performance in predicting the positivity and negativity for chlamydial infection in asymptomatic men. This test could potentially develop into a relevant tool for preselecting asymptomatic men prior to C. trachomatis screening.
    Full-text · Article · Dec 2014 · Journal of Infection and Chemotherapy
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    • "These aspects of UF-1000i realize precise counting of bacteria in urine specimen in a short time. The analyzer has been evaluated in many facilities and has received high commendation for its ability to detect bacteria [17]–[26]. "
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    ABSTRACT: For precise diagnosis of urinary tract infections (UTI), and selection of the appropriate prescriptions for their treatment, we explored a simple and rapid method of discriminating gram-positive and gram-negative bacteria in liquid samples. We employed the NaOH-sodium dodecyl sulfate (SDS) solution conventionally used for plasmid extraction from Escherichia coli and the automated urine particle analyzer UF-1000i (Sysmex Corporation) for our novel method. The NaOH-SDS solution was used to determine differences in the cell wall structures between gram-positive and gram-negative bacteria, since the tolerance to such chemicals reflects the thickness and structural differences of bacterial cell walls. The UF-1000i instrument was used as a quantitative bacterial counter. We found that gram-negative bacteria, including E. coli, in liquid culture could easily be lysed by direct addition of equal volumes of NaOH-SDS solution. In contrast, Enterococcus faecalis, which is a gram-positive bacterium, could not be completely lysed by the solution. We then optimized the reaction time of the NaOH-SDS treatment at room temperature by using 3 gram-positive and 4 gram-negative bacterial strains and determined that the optimum reaction time was 5 min. Finally, in order to evaluate the generalizability of this method, we treated 8 gram-positive strains and 8 gram-negative strains, or 4 gram-positive and 4 gram-negative strains incubated in voluntary urine from healthy volunteers in the same way and demonstrated that all the gram-positive bacteria were discriminated quantitatively from gram negative bacteria using this method. Using our new method, we could easily discriminate gram-positive and gram-negative bacteria in liquid culture media within 10 min. This simple and rapid method may be useful for determining the treatment course of patients with UTIs, especially for those without a prior history of UTIs. The method may be easily applied in order to obtain additional information for clinical prescriptions from bacteriuria.
    Full-text · Article · Oct 2012 · PLoS ONE
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    • "The Sysmex UF-1000i (Sysmex Co. Japan, supplied by Dasit SpA, Cornaredo, Italy) is a novel automated urine cell analyser that uses fluorescence flow cytometry with semi-conductor laser and hydrodynamic focusing conductometry for differentiating between cell populations without technologist intervention or visual identification of formed elements. A previous analytical evaluation of this instrument showed optimal performance for urinalysis, especially for differentiation of white blood cells (WBC), epithelial cells (EC) and small round cells (SRC) [5]. The aim of this study was to assess whether Sysmex UF-1000i might also be suitable for peritoneal fluid analysis, by evaluation of its analytical performances (imprecision, linearity, functional sensitivity, carry-over) and comparison with manual microscopy. "
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    ABSTRACT: To evaluate analytical performance of Sysmex UF-1000i for peritoneal fluid analysis. Functional sensitivity, imprecision, linearity and comparison studies were performed on peritoneal fluids. Total imprecision was 1.6-4.7%, functional sensitivity 27/μL for white blood cell (WBC) and 32/μL for total nucleated cell (TNC) count. Linearity was excellent up to 983cell/μL, carry-over <0.2%, correlation with manual microscopy always greater than 0.992. The instrument exhibited optimal performance at the conventional WBC diagnostic thresholds.
    Full-text · Article · May 2012 · Clinical biochemistry
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