Clinical laboratory automated urinalysis: comparison among automated microscopy, flow cytometry, two test strips analyzers, and manual microscopic examination of the urine sediments

Urinalysis is one of the habitual clinical laboratory procedures, which implies that one of the largest sample volumes currently requires significant labor to examine microscopic sediments. Different analyzers currently used to perform this task have been compared with the manual microscopic sediment examination. The Atlas Clinitek 10 (Bayer Corporation, Diagnostics Division, Tarrytown, NY) and Urisys 2400 (Hitachi Science Systems Ltd., Ibaraki, Japan) test strips analyzers and two automated urinalysis systems, Sysmex UF-100 (Sysmex Corporation Kobe, Japan) and IRIS iQ200 (International Imaging Remote Systems, Chatsworth, CA), have been considered. We assessed the concordance between the results obtained from 652 freshly collected urine samples for erythrocytes (RBC), leukocytes (WBC), squamous epithelial cells (EC), nitrites/bacteria, and crystals using the methodologies mentioned. A principal components analysis was performed in order to examine the correlation between these parameters. Instrument accuracy was also assessed. The Spearman's statistic (p) showed an adequate agreement between methods for RBC (iQ200=0.473; UF-100=0.439; Atlas=0.525; Urisys=0.539), WBC (iQ200=0.695; UF-100=0.761; Atlas=0.684: Urisys=0.620), and bacteria/nitrites (iQ200=0.538; UF-100=0.647; Atlas=0.532; Urisys=0.561) counts. By applying the Wilcoxon and McNemar tests, a concordance degree was found between 82-99 and 52-95% for the values obtained from the two test strips analyzers considered and from the iQ200 and UF-100 systems, respectively. From these results, we can conclude that both test strips analyzers are similar and, on the other hand, that automated urinalysis is needed to improve precision and the response time; but sometimes manual microscopic revisions are required, mainly when flags, because of crystals, are detected.     

Sysmex UF-1000i尿流式分析仪检测住院患者尿标本类酵母菌的临床评价

目的评价Sysmex UF-1000i尿流式分析仪检测尿标本类酵母菌的分析性能。方法应用尿流式分析仪检测我院住院患者尿标本,对仪器检测类酵母菌阳性尿标本进行镜检、培养鉴定;同时随机选择同期仪器检测阴性标本作对照。结合临床,判断患者尿路类酵母菌定植或感染。结果 2010年10月-2010年12月间共检测6019份尿标本,尿流式分析仪检测类酵母菌阳性127份,经培养证实82份为真阳性。同期仪器检测阴性标本121份中有12份培养阳性。以培养作为金标准,尿流式分析仪分析尿中类酵母菌试验敏感性为87.23%、特异性为70.78%、准确度为77.02%、阳性预测值为64.57%,阴性预测值为90.08%。菌种前三位的是以光滑念珠菌(43.40%)、白念珠菌(21.69%)、热带念珠菌(14.15%)。阿萨希毛孢子菌也存在一定比例(5.66%)。尿中类酵母菌真阳性患者多数患有多种基础疾病,以2型糖尿病(25.61%)、慢性泌尿系统疾病(18.29%)和颅脑脊髓损伤(17.07%)为主;实施的医疗措施以抗细菌药物(52.44%)、留置导尿管(35.37%)多见(P<0.05)。尿流式分析仪检测阴性而培养阳性12例患者均为尿路念珠菌定植。尿流式分析仪检测阳性并且培养阳性82例患者中,69例(84.15%)为类酵母菌尿路定植;13例(15.85%)为尿路感染,其中1(1.22%)例发展为热带念珠菌血症。结论 Sysmex UF-1000i尿流式分析仪对尿标本类酵母菌有较强的筛查价值。实验室应对仪器类酵母菌检测阳性标本进行镜检后确认。临床医师应对类酵母菌检测阳性患者结合其临床表现,采取不同的治疗措施。     

Automated flow cytometric analysis of cerebrospinal fluid

BACKGROUND: Recently, the UF-100 (Sysmex Corporation) flow cytometer was developed to automate urinalysis. We evaluated the use of flow cytometry in the analysis of cerebrospinal fluid (CSF). METHODS: UF-100 data were correlated with microscopy and biochemical data for 256 CSF samples. Microbiological analysis was performed in 144 suspected cases of meningitis. RESULTS: Good agreement was obtained between UF-100 and microscopy data for erythrocytes (r = 0.919) and leukocytes (r = 0.886). In some cases, however, incorrect classification of lymphocytes by the UF-100 led to underestimation of the leukocyte count. UF-100 bacterial count positively correlated (P < 0.001) with UF-100 leukocyte count (r = 0.666), CSF total protein (r = 0.754), and CSF lactate concentrations (r = 0.641), and negatively correlated with CSF glucose concentration (r = -0.405; P < 0.001). UF-100 bacterial counts were unreliable in hemorrhagic samples and in samples collected by ventricular drainage where interference by blood platelets and cell debris was observed. Another major problem was the UF-100 "bacterial" background signal in sterile CSF samples. Cryptococcus neoformans yeast cells and cholesterol crystals in craniopharyngioma were detected by the flow cytometer. CONCLUSIONS: Flow cytometry of CSF with the UF-100 offers a rapid and reliable leukocytes and erythrocyte count. Additional settings offered by the instrument may be useful in the diagnosis of neurological disorders.     

Cutoff values for bacteria and leukocytes for urine flow cytometer Sysmex UF-1000i in urinary tract infections

Because urinary tract infections (UTIs) are a quite common disease, the gold standard for diagnosing UTIs is still bacterial culture, although a large percentage of samples are negative: unnecessary cultures can be reduced by means of an effective screening test. The analytic performance of a new urine cytometer, the UF-1000i, has been tested on 1463 urine samples submitted to our laboratory for culture. Bacteria and leukocyte counts have been compared by means of the UF-1000i with colony-forming unit (CFU) quantification on citrate lactose electrolytes deficient agar to assess the best cutoff values. By using quantitative cultures and considering as positive a sample with 10 × 10⁵ CFU/mL, 546 positive samples (37%) were observed. If compared with 10 × 10⁵ CFU/mL, the cutoff values obtained were 125 bacteria/μL and 40 leukocytes/ μL, respectively. Analytic parameters such as sensitivity, specificity, positive predictive value, negative predictive value, and correctly classified incidence were satisfactory. Based on the results obtained in this study, when using the UF-1000i analyzer for a screening test for UTI, a cutoff value of 40 white blood cells/μL should be adopted. The cutoff value for bacteria should be 125/μL for those clinical conditions in which 10 × 10⁵ CFU/mL indicates a positivity.     

Automation of urine sediment examination: a comparison of the Sysmex UF-100 automated flow cytometer with routine manual diagnosis (microscopy, test strips, and bacterial culture).

Urine specimens from 438 patients were examined with the UF-100 flow cytometer (Sysmex TOA Medical Electronics (Europe) GmbH, Hamburg, Germany) and by manual microscopy and test strips. One hundred and forty-two of these were also examined bacteriologically. The measurements with the UF-100 were performed on native urine without prior centrifugation. Intraassay imprecision, CV of 1.3% (547/microliter) to 8.5% (24/microliter) for erythrocytes and CV of 2.4% (218/microliter) to 5.6% (10/microliter) for leukocytes, are similar to those usual in clinical chemistry, and are very much better than those seen in manual microscopy of sediment. In routine use, overloading the flow cytometer by an excessive concentration of particles was observed in 9% of specimens. Such specimens should be checked visually. The UF-100 is distinctly more sensitive than manual microscopy for determining leukocytes, erythrocytes, epithelial cells and bacteria. Reference ranges were estimated from the results obtained. These enabled the UF-100 to replace routine manual diagnostic methods. Although the sensitivity is improved over manual microscopy of sediment, it is always necessary to perform parallel test strip examination when determining erythrocytes in order to detect haemolysis. In our opinion the Sysmex UF-100 is a suitable replacement for manual microscopy of urine sediment. In addition it offers an opportunity to improve standardization of basic urinalysis.     

Evaluation of Sysmex UF-1000i for use in cerebrospinal fluid analysis

BACKGROUND: Caution is of paramount importance in the interpretation of flow cytometric white blood cell counts in specimens with a high lymphocyte percentage as it is in the interpretation of bacterial counts in hemorrhagic and ventricular drainage CSF specimens. Recently, flow cytometry using a semiconductor laser along with forward and sideward scatter detection and also a dedicated bacterial channel has been developed (Sysmex UF-1000i). We explored the possible applications of this novel approach in the differential diagnosis of meningitis. METHODS: Flow cytometry, microscopy and biochemical data of 161 CSF samples were analyzed. Microbiological analysis was performed in 53 suspected cases of meningitis. RESULTS: Good agreement for leukocytes was obtained between UF-1000i (rho=0.614) and UF-100 (rho=0.582) and microscopy and between both flow cytometers (rho=0.734). Lymphocytes were correctly classified as WBC by UF-1000i. Bacterial count on UF-1000i showed to be reliable in hemorrhagic samples and in samples collected by ventricular drainage for which interference by blood platelets and cell debris forms a known caveat on UF-100. Bacterial background signal in sterile CSF samples was absent on UF-1000i. One case of Cryptococcus neoformans meningitis, missed by UF-100 was properly detected by UF-1000i. CONCLUSION: Sysmex UF-1000i CSF flow cytometer offers the clinician an improved aid in directing the differential diagnosis of meningitis towards viral, bacterial or fungal causes.     

The efficient workflow to decrease the manual microscopic examination of urine sediment using on-screen review of images

BackgroundThe manual microscopic examination (MME) of urine sediment is labor-intensive, time-consuming, and imprecise. Therefore, automated urinalysis systems based on flow cytometry or digital imaging techniques could replace MME. The purpose of this study was to evaluate the rate of MME using two automated urine sediment analyzers, alone and in combination.MethodsThis study was conducted using the freshly collected urine specimens of 1055 in-patients and 1119 out-patients. All samples were analyzed using UF-1000i (Sysmex Corporation) and Cobas 6500 instrument (Roche Diagnostics International). The rate of MME was evaluated using two analyzers, both individually and in combination.ResultsUsing the UF-1000i alone, 34.2% and 16.8%, respectively, of in- and out-patient samples were analyzed by MME, compared to 15.6% and 3.7%, respectively, using the Cobas 6500. In combined assay using the UF-1000i followed by the Cobas 6500, 27.9% and 11.3% in-patient samples required on-screen review and MME, respectively. And the respective rates were 10.3% and 2.7% of out-patient. Samples using the Cobas 6500 followed by the UF-1000i, 42.3% and 11.3% in-patient needed on-screen review and MME, respectively. And the respective rates were 18.9% and 2.7% of out-patient samples.ConclusionsUse of the Cobas 6500 compared to the UF-1000i resulted in decreases in the rate of MME from 34.2% to 15.6% for in-patient samples, and from 16.8% to 3.7% for out-patient samples. Use of the Cobas 6500 reduced the rate of MME, and compared to use of only the Cobas 6500, the combined use resulted in a reduction in the rate of on-screen review.     

UF-1000i尿液有形成分分析仪、干化学法和镜检法对尿液分析的比较

目的探讨Sysmex UF-1000i全自动尿液有形成分分析仪（简称UF-1000i）对尿液中红细胞（RBC）、白细胞（WBC）和管型（CAST）检测的敏感性。方法对1 054例患者的尿液分别用UF-1000i、URISys-2400全自动干化学分析仪（干化学法）及Diasys R/S2005定量分析工作站（镜检法）3种方法进行分析,并比较3种方法对RBC、WBC、CAST的检测敏感性。结果 UF-1000i检测RBC、WBC、CAST的阳性率分别为20.6%、20.3%、6.7%;干化学法检测出RBC、WBC的阳性率分别为24.5%、17.9%;镜检法检出RBC、WBC、CAST的阳性率分别为16.9%、20.5%、2.2%。3种方法RBC、CAST的检出率差异有统计学意义（P〈0.01）,WBC的检出率差异无统计学意义（P〉0.05）。结论 UF-1000i不能完全取代尿沉渣镜检,建议3种方法联合应用以减少检验误差,提高尿液分析质量。     

Quantitative evaluation of urinalysis test strips

BACKGROUND: Urine test strip results are generally reported in categories (i.e., ordinal scaled), but automated strip readers are now available that can report quantitative data. We investigated the possible use of these meters to complement flow cytometry of urine and compared reflectance readings with quantitative determinations of urinary glucose and microalbumin. METHODS: We compared URISYS 2400 (Roche) quantitative reflectance data with data from the UF-100 (Sysmex) and biochemical data for 436 nonpathologic and pathologic urine samples. RESULTS: Reproducibility of the reflectance signal was good for high- and low-concentration urine pools for protein (0.8% and 0.9% and 1.5% and 2.2% within and between runs, respectively), leukocyte esterase (1.1% and 1.0%; 5.1% and 1.2%), hemoglobin (1.7% and 1.1%; 8.9% and 1.1%) and glucose (2.1% and 0.5%; 6.5% and 2.3%). Fair agreement was obtained between UF-100 and test strip reflectance data for erythrocytes and hemoglobin (r = -0.680) and leukocytes and leukocyte esterase (r = -0.688). Higher correlations were observed for biochemical and test strip data comparing protein and albumin (r = -0.825) and glucose data (r = -0.851). The lower limits of detection for erythrocytes and leukocytes were 8 x 10(6)/L and 19 x 10(6)/L, respectively. The protein test (n = 220) detected 86% (95% confidence interval, 78-92%) of samples with <30 mg/L albumin with a specificity of 84% (95% confidence interval, 76-91%). CONCLUSIONS: In urine test strip analysis, quantitative hemoglobin and leukocyte esterase reflectance data are complementary with flow cytometric results and glucose and albumin results.     

UF-1000i尿液沉渣分仪析检测尿红细胞的影响因素

目的：探讨UF-1000i尿液沉渣分仪析检测尿红细胞（Red Blood Cell, RBC）影响因素。方法对住院病人400例晨尿标本同时进行UF-1000i尿液沉渣分仪析检测和尿沉渣显微镜检查,分析两者结果的差异。结果400例受检标本中,UF-1000i检测RBC阳性144例,阳性率36.0%,显微镜检测的RBC阳性131例,阳性率32.8%,尿沉渣分析仪RBC检测结果与镜检结果比较存在假阳性。两种方法检测RBC的差异有统计学意义（χ2=6.85714,P＆lt;0.01）。结论当尿液中细菌集簇分布、酵母菌污染、存在草酸钙结晶等可引起UF-1000i尿液沉渣分析仪尿RBC检测结果假阳性,应通过显微镜镜检来纠正其对尿RBC检测的影响。     

Performance of automated urine analyzers using flow cytometric and digital image-based technology in routine urinalysis

Abstract

The purpose of this study was to evaluate the analytical performances of Sysmex UF-5000 and Dirui FUS-200 and to compare the results with manual microscopy and between each other.

Two hundred fifty urine samples were analyzed for evaluation. Mid-stream specimens were studied sequentially using Dirui FUS-200 and Sysmex UF-5000, and also with manual microscopy within one hour. The physical and chemical components of urinalysis, and sediment results were investigated.

The precision results of the FUS-200 and UF-5000 for WBCs, RBCs, and ECs were acceptable. The both analyzers demonstrated good linearity (r?>?0.97), with no carry-over. The comparisons of FUS-200 and UF-5000 with manual microscopy for RBCs, WBCs, and ECs on 250 samples exhibited good agreement with little bias (R?>?0.780). Only, the moderate agreements were obtained for calcium oxalate for both analyzers (R?=?0.512, and 0.648, respectively). The sensitivities of the FUS-200 and UF-5000 were 75.8% and 86.8%, with specificities of 92.3% and 87.8% for WBCs, for RBCs the sensitivities were 91.1%, and 84.4% with specificities of 82.2%, and 89.6% for both analyzers. Kappa values of the UF-5000 were higher than FUS-200 for WBCs, RBCs, ECs, and calcium oxalate.

The FUS-200 and UF-5000 urine analyzers, are both accurate, very precise systems and can be safely used in clinical laboratories. However, due to the technological characteristics of the UF-5000 analyzer, its positive impacts on the morphologic recognition and enumeration of RBCs and WBCs should be taken into account, particularly in university hospital laboratories with high patient volumes.     

UF-1000i尿沉渣分析仪与显微镜检测尿液小圆上皮细胞对比分析及参考值建立

目的通过对UF-1000i尿沉渣分析仪与显微镜检测尿液中小圆上皮细胞结果对比分析及其参考值的建立,为临床提供更为准确可靠的实验数据和诊断参考区间。方法随机收集沙井人民医院肾内科及泌尿外科住院或门诊患者165例中段清晨尿,分别用UF-1000i尿沉渣分析仪与显微镜检测尿液中小圆上皮细胞,对检测结果进行对比分析。同时随机收集1 296例健康体检者中段清晨尿液用显微镜检测尿中小圆上皮细胞,建立健康人群的临床诊断参考区间。结果以显微镜检测为金标准,尿液中白细胞正常情况下,UF-1000i尿沉渣仪检测尿液小圆上皮细胞略高于显微镜法,但差异无统计学意义（t=1.24,P〉0.05）,而尿液中白细胞增高情况下,UF-1000i检测结果高于显微镜法,差异有统计学意义（t=6.92,P〈0.01）。健康人群中段晨尿小圆上皮细胞参考值,年龄与性别之间差异无统计学意义（t=1.06,P〉0.05）,但女性结果略高于男性。结论尿液中白细胞增高情况下,UF-1000i尿沉渣分析仪检测小圆上皮细胞与显微镜检测结果之间有较大的差异,对白细胞检查结果异常者需用显微镜进行复检,以提高结果的准确性;建立生化指标参考区间,为临床诊断、治疗提供更有价值的诊断依据。     

三种方法在尿液有形成分分析中的对比观察

目的 探讨UF-1000i尿液有形成分分析仪与干化学方法、手工显微镜检查尿中红细胞(RBC)、白细胞(WBC)的符合情况及影响因素.方法 使用UF-1000i 尿有形成分分析仪、干化学分析仪与显微镜分别检测996例尿液标本中RBC、WBC,将3种方法的检测结果进行比较.结果 分别以RBC、WBC超过25和30个/μL为...     

Roche Cobas 6500全自动尿液分析仪与其他系统的性能比较及效率评估

目的观察罗氏Roche Cobas 6500全自动尿液分析流水线与Arkray AX-4030、Urisys 2400、Sysmex UF-1000i尿液干化学、尿液有形成分检测结果之间的可比性。方法分别对Cobas u601与Urisys 2400尿液干化学检测性能,Cobas u601与Arkray AX-4030、Urisys 2400抗维生素C的干扰能力评估;比较Cobas u701与KOVA人工镜检计数在尿液有形成分检测差异,比较Cobas u701和Sysmex UF-1000i检测透明管型(Hya)、尿细菌计数(Bac)、病理管型(Pat)及结晶(Cry)的结果差异;比较Cobas 6500系统与Arkray AX-4030、Sysmex UF-1000i联合检测时的周转时间(TAT)差异。结果 Cobas u601与Urisys 2400尿液干化学9个参数检测结果的比对符合率均超过90%;Cobas 6500携带污染率为0%,未发现携带污染且未受到维生素C的干扰。在尿液有形成分检测中,Cobas 6500与镜检标准对照,阴阳性符合率均较高。结论 Cobas u601、Cobas u701与其他仪器检测结果的符合率较高,在检测重复性、携带污染率、抗维生素C干扰方面较好,Cobas 6500尿液分析仪能提高检验科日常TAT。     

Prediction of presence of fastidious bacteria by the Fully Automated Urine Particle Analyzer UF-1000i in the case of ineffective antimicrobial therapy for urinary tract infection

IntroductionRecent studies have reported associations between fastidious bacteria that are difficult to grow and isolate in conventional urine culture conditions and urinary tract infections (UTIs). Because the Fully Automated Urine Particle Analyzer UF-1000i (hereinafter referred to as “UF-1000i”) detects fastidious bacteria without being affected by culture conditions, owing to its flow cytometry-based principle, we evaluated the robustness of UF-1000i detection using clinical urine samples from patients with UTIs following ineffective antimicrobial therapy.MethodsA total of 150 patients diagnosed with UTIs were enrolled, and their laboratory findings were analyzed, focusing on the discrepancy in bacterial numbers between UF-1000i and conventional culture at each antimicrobial therapy effectiveness classification. In addition, gene identification was conducted by molecular analysis using 16S ribosomal RNA gene sequencing and next-generation sequencing (NGS) to elucidate the reason for the presence of fastidious bacteria in these samples.ResultsThe ineffective therapy cases showed more than 100-fold discrepancy in bacterial counts, with a higher proportion (30.8%) than effective therapy cases without secondary administration (5.7%) between the bacterial counts in UF-1000i and conventional culture methods. The presence rates of fastidious bacteria were 100% and 66.7% in discrepant cases of ineffective and effective without secondary administrations, respectively.ConclusionThis study suggests that discrepancies in bacterial numbers between the conventional culture method and UF-1000i measurement at the primary visit can predict the presence of fastidious bacteria, especially in cases of ineffective antimicrobial therapy.     

基于UF1000i尿沉渣分析仪对Clinitek Atlas尿干化学分析仪白细胞计数与反射率的关系研究及思考

目的 借助UF1000i尿沉渣分析仪,验证尿干化学分析仪中白细胞计数和反射率之间的潜在关系,从而为尿干化学分析仪的定量改进提供新的思路。方法 通过筛选尿白细胞计数大于1 000/μl的尿标本,在UF1000i尿沉渣分析仪和Clinitek Atlas尿干化学分析仪上同时测试,记录尿沉渣白细胞计数和尿干化学反射率值,并统计分析两者的相关定性等级的反射率临界点和白细胞临界点验证。结果 尿沉渣白细胞计数（X）和反射率（Y）存在较好的关系曲线：Y=109.14 ln(X)+931.94,r=0.995 8;尿干化学微量、1+,2+和3+的临界值反射率分别为1 150,1 231,1 380和1 553;对应的白细胞临界值（个/μl）分别为5,10,52和330。结论 尿干化学白细胞计数与反射率的确立,为现行的尿干化学分析仪的校准提供了新的解决思路,也为尿干化学分析仪由定性向定量发展奠定了基础,从而使尿干化学检测服务于临床的质量更进一步。     

Combination of UC-3500 and UF-5000 as a quick and effective method to exclude bacterial urinary tract infection

BackgroundOur study aims to evaluate the performance of the combination of Sysmex urine dry chemistry analyzer UC-3500 and urine particle analyzer UF-5000 in screening bacterial urinary tract infection (UTI).MethodsWe analyzed 2000 urine specimens from patients with suspected UTI by using a urine dry chemistry analyzer (UC-3500) and a fully automated sediment analyzer (UF-5000). After being tested by the instrument, all specimens were sent to our clinical microbiology laboratory for culture. In addition, 600 urine specimens were selected to evaluate the accuracy of the six screening strategies established in this study.ResultsThe consistency of UF-5000 bacterial classification and bacterial culture was fair (Kappa = 0.339). The counts of WBC and BACT elevated with sequential group designs (P < 0.001). The cut-off value of WBC was 32.20/μL for males (AUC, 0.942, 95%CI, 0.930–0.955) and 39.15/μL for females (AUC, 0.931, 95%CI, 0.914–0.948). The sensitivity and specificity of WBC were relatively higher than those of BACT. Strategy④ and Strategy⑥ in all six strategies had a good negative predictive value (NPV) which was 98.73%.ConclusionUF-5000 bacterial classification cannot be used as a practical reference. 32.20/μL (male) and 39.15/μL (female) for WBC as well as 22.35/μL (male) and 127.25/μL (female) for BACT were used as cut-off values to effectively determine whether UTI occurs. WBC, BACT and LEU joint screening programs were suitable to rapidly and effectively exclude bacterial UTI.     

UF-1000i全自动尿有形成分分析仪对尿路感染的诊断价值

目的 研究UF-1000i尿有形成分分析仪对诊断尿路感染的价值.方法 采用UF-1000i尿有形成分分析仪检测150份临床尿液标本的白细胞、酵母样真菌及细菌计数,将这3项检测结果结合起来判断是否具有尿路感染(UTI)信息,并记录下具有UTI信息标本的散点图.同时将尿标本进行细菌培养和鉴定,将UF-1000i尿有形成分分析仪的检测结果与之做比较分析.以临床诊断尿路感染的标准作为诊断UTI的金标准,计算UF-1000i尿有形成分分析仪对诊断UTI的敏感度、特异度等评估参数,以及细菌散点图分布与尿细菌培养结果、临床诊断的符合情况.结果 通过对146份标本的比较分析,UF-1000i尿有形成分分析仪阳性检出率为32.9%(48/146),细菌培养阳性检出率为28.8%(42/146),2种检测方法之间差异无统计学意义(χ2=1.79,P0.05),且一致性较好(Kappa=0.775 6).UF-1000i尿有形成分分析仪判断筛选UTI信息的敏感度为76.0%(38/50),特异度为89.6%(86/96),阳性预测值为79.2%(38/48),阴性预测值为87.8%(86/98);UF-1000i尿有形成分分析仪测得细菌的球杆菌分布与细菌培养结果基本一致.结论 UF-1000i尿有形成分分析仪的"YTU信息"研究参数对诊断尿路感染具有重要价值.     

不同原理尿液分析仪检测尿有形成分结果比较及显微镜复检规则探讨

目的 分析尿有形成分分析仪、尿干化学分析仪及显微镜尿沉渣结果 的差异,建立显微镜复检规则.方法 以UF-1000i尿有形成分分析仪及AX-4280尿干化学分析仪构成检测流水线,对临床尿标本先用流水线进行红细胞(RBC)、白细胞(WBC)及管型(CAST)检测,再用显微镜进行结果 验证.结果 UF-1000i检测RBC、WBC灵敏度高于AX-4280,但特异度低于AX-4280;流水线检测尿标本的阴性预测值达100.00%.UF-1000i分析仪与显微镜尿沉渣WBC、RBC、CAST检测结果 存在明显差异(χ2值分别为16.41、13.47、16.41,P＜0.05).建立适合该流水线的显微镜复检规则.结论 UF-1000i和AX-4280分析仪检测结果 有可能存在差异,此时不能以UF-1000i代替显微镜尿沉渣检查,需参照相应的复检规则进行复检,保证检测结果 准确性.     

UF-100尿液自动分析仪和显微镜检测RBC形态在鉴别肾性血尿中的比较

目的探讨尿液RBC形态检测的临床意义。方法采用UF-100和显微镜法对118例尿液标本进行正形(均一性)和异形(非均一性)RBC的检测,将两者结果进行比较分析。结果62例肾性血尿患者中显微镜检测有56例异形RBC增高,临床诊断符合率为90.3%;UF-100检测有58例为非均一性RBC,临床诊断符合率为93.5%。56例非肾性血尿中显微镜检测有54例正形RBC增高,临床诊断符合率为96.4%;UF-100检测有55例为均一性RBC,临床诊断符合率为98.2%。两法比较,经配对x2检验,P>0.05,结果无显著性差异。而肾性和非肾性血尿组相比,经四格表资料x2检验,P<0.05,结果显示两组有显著性差异。结论UF-100和显微镜对RBC形态的检测都可以用于鉴别诊断肾性和非肾性血尿。尤其是UF-100可为临床诊断疗效观察和判断预后起到非常重要的作用。