尿液流水线分析系统联合显微镜检对尿路感染的诊断价值

目的探讨Sysmex UC-3500尿干化学分析仪(简称UC-3500)与UF-5000尿沉渣分析仪(简称UF-5000)的相关参数联合尿沉渣显微镜检在诊断尿路感染(UTI)中的应用价值。方法对该院2021年2—3月1 036例患者的清洁中段尿进行尿干化学分析、流式尿沉渣分析及尿离心显微镜检,另送尿培养鉴定,以尿培养结果作为"金标准",分析尿中性粒细胞酯酶(LEU)、白细胞计数(WBC)、细菌计数(BACT)3项指标联合显微镜检诊断UTI的灵敏度、特异度、符合率。结果 1 036例尿标本中299例(28.86%)尿培养阳性,其中革兰阳性菌162例,革兰阴性菌108例,革兰染色不定的细菌仪器7例(阴道加德纳菌),真菌21例。仪器LEU+WBC+BACT 3项指标联合、显微镜检以及显微镜检联合仪器UTI报警诊断UTI的曲线下面积(AUC)分别为0.635、0.698和0.761;将显微镜检联合UF-5000的仪器UTI报警后,其诊断UTI的符合率由72.18%升高至79.90%。UF-5000的细菌革兰染色分型对革兰阴性菌的符合率(78.82%)高于革兰阳性菌的符合率(47.06%)。类酵...     

UF-1000i尿有形成分分析仪在尿路感染筛查中的应用评价

目的评价UF-1000i尿流式有形成分分析仪在尿路感染（UTI）筛查中的应用价值。方法应用UF—1000i尿流式有形成分分析仪检测148例疑似uTI患者中段尿标本中的细菌（BACT）数和白细胞（WBC）数,以定量尿细菌培养作为诊断UTI金标准,应用受试者工作特征（ROC）曲线确立阳性判断标准,评价UF-1000i尿流式有形成分分析仪诊断UTI的敏感性、特异性、阳性预测值、阴性预测值和准确性。结果UF—1000i尿有形成分分析仪BACT和WBC诊断UTI的cut—off值分别为325个／汕和48个／μL,其诊断UTI的敏感性、特异性、阳性预测值、阴性预测值、准确性分别是：78．3％、92．2％、81．8％、90．4％、87．8％和73．9％、81．4％、64．2％、87．4％、79．1％。UF—1000i联合诊断uTI的敏感性、特异性、阳性预测值、阴性预测值和准确性分别95．7％、70．6％、59．5％、97．3％、78．4％。结论UF．1000i尿有形成分分析仪可作为UTI的快速筛查工具。     

尿流式有形成分及干化学分析在尿路感染诊断中的应用评价

目的 评价尿干化学分析及UF-1000i流式尿有形成分分析单独及联合应用时在尿路感染诊断中的应用价值.方法 留取148例尿路感染(UTI)患者、284例非尿路感染患者的中段尿标本,分别用培养法做尿细菌计数和鉴定,用UF-1000i流式尿有形成分分析仪做细菌计数(BACT)、酵母样菌(YEC)、WBC检测,用URISYS 2400尿干化学分析仪做自细胞酯酶(LEU)、亚硝酸盐(NIT)检测.评价尿干化学分析、UF-1000i流式尿有形成分分析仪以及UF-1000i联合尿干化学分析与定量尿细菌培养对诊断UTI的一致程度,并评价其对UTI诊断的敏感度、特异度、阳性预测值、阴性预测值、准确度.结果 在148例尿路感染患者中,定量尿细菌培养的检出率为73.6%(109/148),尿干化学分析LEU和NIT同时为阳性的检出率为26.4%(39/148),两种方法的检出率之间差异有统计学意义(χ2=55.68,P<0.05).UF-1000i流式尿有形成分分析BACT和WBC任意1项为阳性诊断UTI的检出率为91.2%(135/148),高于定量尿细菌培养的检出率,差异有统计学意义(χ2=14.70,P<0.05).UF-1000i流式尿有形成分分析和尿干化学分析仪联合参数BACT、WBC、LEU和NIT任意1项为阳性诊断UTI的检出率为94.6%(140/148),高于定量尿细菌培养的检出率,差异有统计学意义(χ2=20.45,P<0.05).尿干化学分析敏感度较低,为26.4%(39/148),特异度较高,为99.3%(282/284);应用UF-1000i流式尿有形成分分析BACT作为尿路感染诊断依据时的敏感度为92.6%(137/148),特异度为39.8%(113/284),阳性预测值为44.5%(137/308),阴性预测值为91.1%(113/124);尿干化学分析与UF-1000i流式尿有形成分分析联合应用时,敏感度为98.O%(145/148),阴性预测值97.1%(100/103),特异度为35.2%(100/284),阳性预测值为44.1%(145/329),准确度为56.7%(245/432).结论 联合UF-1000i流式尿有形成分分析及尿干化学分析可在早期尿路感染筛查诊断中发挥重要作用;同时对尿细菌培养为阴性的UTI患者的明确诊断具有重要价值.     

住院患者尿路感染筛查中尿有形成分分析的价值

目的评价尿有形成分分析在住院患者尿路感染(UTI)筛查中的应用价值。方法对2018年4月-2018年10月于大连大学附属中山医院住院疑似尿路感染的患者清洁中段尿标本497例进行尿有形成分分析、尿定量细菌培养及菌种鉴定。结果尿有形成分分析仪检测白细胞数和细菌数的阈值为白细胞数64个/μL和细菌数880.6个/μL,以该阈值筛检住院患者尿路感染,其敏感度分别为80.00%和85.19%,特异度分别为79.28%和87.39%。白细胞计数和细菌计数ROC曲线下面积分别为0.860和0.917。结论UF-1000i尿有形成分分析仪中白细胞和细菌计数可作为临床尿路感染快速筛检的辅助实验诊断方法。     

应用受试者工作特征曲线探讨UF-1000i尿沉渣分析仪在快速筛检泌尿系统感染中的应用

目的 应用受试者工作特征（ROC）曲线探讨UF-1000i尿沉渣分析仪定量检测尿沉渣白细胞（WBC）和细菌计数作为快速筛检泌尿系统感染指标的可行性。 方法 2013年8月－12月分别用定量细菌培养法和UF-1000i自动尿沉渣分析仪检测218例疑似泌尿系统感染患者清洁中段尿标本。 结果 218例尿沉渣标本中尿液细菌培养阳性标本为65例,以尿培养阳性为金标准制作ROC曲线,UF-1000i尿沉渣分析仪检测WBC和细菌计数的ROC曲线下面积分别为0.839和0.894;最佳约登指数的WBC和细菌计数的临界值分别为≥31.0/μL和≥38.8/μL。以此为临界值其WBC计数的灵敏度和特异度分别为78.3%和80.4%,阳性似然比为3.99,阴性似然比为1.11;细菌计数的灵敏度和特异度分别为84.3%和80.6%,阳性似然比为4.30,阴性似然比为0.80。 结论 以UF-1000i尿沉渣分析仪检测白细胞计数≥31.0/μL和细菌计数≥38.8 /μL为临界值作为无创性检测指标,在早期筛检泌尿系统感染,判断是否需要进行尿液培养,以及指导临床合理应用抗生素等方面具有重要应用价值。     

COBIO XS尿沉渣分析仪在尿路感染筛查中的应用

目的评价COBIO XS尿沉渣分析仪在尿路感染中的应用。方法应用COBIO XS尿沉渣分析仪检测182例疑似尿路感染中段尿标本白细菌和细菌数,以定量尿细菌培养作为诊断尿路感染金标准,应用受试者工作特性(ROC)曲线评价各指标诊断效能。结果尿培养阳性标本56例占30.8%,分离率依次为大肠埃希菌30株占53.6%、肠球菌属9株占16.1%、变形杆菌属6株占10.7%。白细胞计数曲线下面积为0.808(95%CI 0.710～0.867),当白细胞临界值为50/μL,诊断尿路感染敏感度89.0%,特异度83.8%,阳性预测值86.3%,阴性预测值93.7%。细菌计数曲线下面积为0.899(95%CI 0.797～0.923),当细菌临界值为110/μL,诊断尿路感染敏感度82.5%,特异度85.6%,阳性预测值78.5%,阴性预测值88.0%。结论 COBIO XS尿沉渣分析仪具有快速、准确等优点,可作为筛查尿路感染工具。     

Pediatric reference values for urine particle quantification by using automated flow cytometer: Results of a multicenter study of Italian urinalysis group

Objectives

The purpose of this Italian multicenter study was to define pediatric upper reference values for urine particle quantification by using automated flow cytometry.

Design and methods

Four hospital-based clinical laboratories participated in this multicenter investigation, which included a total study population of 161 Italian children aged from 1 to 12 years. Two laboratories used Sysmex UF-100 and analyzed 86 children, whereas the other two used Sysmex UF-1000i and analyzed 75 subjects. Particle quantification included the analysis of white blood cells (WBC), red blood cells (RBC), squamous epithelial cells (EC), transitional epithelial cells (TC), casts (CAST) and bacteria (BACT).

Results

The upper reference values in subjects tested with the Sysmex UF-100 were 9.7 WBC/μL, 10.1 RBC/μL, 7.5 EC/μL, 2.5 TC/μL, 0.7 CAST/μL and 3090 BACT/μL, whereas the upper reference values in subjects tested with the Sysmex UF-1000i were 10.5 WBC/μL, 8.3 RBC/μL, 7.2 EC/μL, 2.9 TC/μL, 0.7 CAST/μL and 48 BACT/μL. No statistically significant differences between genders were found in the value distribution of any of the parameters tested. Similarly, no statistically significant differences were observed between the two urine analyzers, except for BACT.

Conclusions

Automated analysis of urine particles appears a suitable means to optimize the workflow of routine urinalysis of children specimens. The upper reference limits for pediatric subjects obtained in this study were comparable to those previously reported in the literature, with no significant differences between genders and analyzers.     

两台Sysmex UF-1000i全自动尿沉渣分析仪检测结果的比对研究

目的探讨实验室内不同全自动尿沉渣分析仪检测结果之间的差异是否在允许范围之内,以提高检验结果的准确性、一致性、可比性。方法以Sysmex UF-1000i全自动尿沉渣分析仪（LJ-25）作为标准仪器,在两台全自动尿沉渣分析仪均处于正常状态下,双份检测新鲜尿液,获取红细胞计数（RBC/μL）、白细胞计数（WBC/μL）、上皮细胞计数（EC/μL）、管型计数（CAST/μL）及细菌计数（BACT/μL）,将检测结果进行通过率计算及比对试验,并参照Sysmex公司的仪器说明书提供的标准作为各参数的允许范围进行评估。结果两仪器检测结果显示,RBC、WBC、EC、CAST及BACT比对通过率88.09%、88.09%、92.86%、52.38%、35.71%;线性相关系数（r）为0.998、0.997、0.993、0.417、0.971,CAST、BACT结果比较差异无统计学意义（P〉0.05）,RBC、WBC、EC结果比较差异有统计学意义（P〈0.05）。结论临床实验室应加强对所有检测项目结果的可靠性进行验证,做好尿沉渣分析仪室内质控的同时定期进行仪器比对试验,以保证不同仪器上的检测结果具有可比性、准确性、一致性、持续性的质量保证。     

评价UF-500i尿沉渣分析仪在诊断尿路感染中的应用

目的 探讨UF-500i尿沉渣分析仪对尿路感染诊断的价值.方法 采集该院345例门诊、住院患者清洗外阴后取中段尿,使用UF-500i尿沉渣分析仪测定尿液白细胞和细菌数,同时进行尿液的细菌培养,以细菌培养结果为金标准,并以大于或等于10×105 CFU(集落形成单位 colony-forming units)/mL 为阳性诊断标准.利用SPSS13.0统计软件绘制受试者工作特征ROC曲线,从而计算出白细胞和细菌数在尿路感染的诊断阈cut off值,得出其灵敏度、特异性、阴/阳性预测值和假阳性/阴性率.结果 尿培养结果阳性的标本96例(27.8%),得出细菌数和白细胞数cut off值分别为130.2个/μL和29.8个/μL,其联合测定对尿路感染诊断的灵敏度,特异度,假阳性率,假阴性率分别为73.58%,95.20%,26.42%,4.80%.结论 UF-500i尿沉渣分析仪是一种简单快速、可靠的尿液筛查实验,其细菌和白细胞计数可以作为尿路感染诊断检测的良好指标.     

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.     

UF-1000i flow cytometry is an effective screening method for urine specimens

This study was undertaken to evaluate the UF-1000i™ (UF) flow cytometer to count urine constituents including bacteria. The objective was to screen urine samples and determine what white blood cell (WBC) and/or bacteria screening criteria would minimize the number of specimens cultured yet ensuring that all true positives were cultured. UF screening and culture on CHROMagar™ Orientation (CO) medium were performed on 2496 specimens. Various combinations of WBC/bacterial counts were assessed as screening criteria and correlated with significant growth on CO medium. A bacterial count of ≥20 from UF gave an overall screening sensitivity of 92.6%, allowing 35% of specimens to be screened out and not cultured. The sensitivity was 99.2% and 85.0% for Gram-negative and Gram-positive organisms, respectively, using the same bacterial count. Our study indicated that UF was a simple, rapid, and reliable method for urine screening when the bacterial count of ≥20 was used as the sole screening criterion.     

全自动尿液有形成分分析仪细菌检测对尿路感染诊断价值的探讨

目的探讨UF-1000i全自动尿液有形成分分析仪细菌信息对临床尿路感染(UTI)诊断的应用价值。方法收集216例临床疑似尿路感染患者尿液样本,分别采用UF-1000i全自动尿液有形成分分析仪和尿液细菌培养及鉴定,比较两者结果。结果 216例临床诊断为尿路感染患者的UF-1000i全自动尿液有形成分分析仪细菌数量检测阳性率为38.0%(82/216),细菌培养阳性率为31.0%(67/216),两种方法检测结果经统计无显著性差异(P0.05)。UF-1000i全自动尿液有形成分分析仪细菌检测诊断尿路感染的敏感度为69.0%、特异性为82.9%、假阳性率为17.1%、假阴性率为31.0%、阳性预测值为73.2%、阴性预测值为79.8%、诊断符合率为77.3%。结论 UF-1000i全自动尿液有形成分分析仪检测简易、快速,细菌检测有助于及时辅助尿路感染临床诊断,可作为临床筛查的手段。     

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。     

自动化尿液干化学和有形成分分析复检规则的制定和应用

目的 结合尿液干化学分析(简称干化学)和有形成分分析(简称尿流式),制定自动化尿常规分析的复检规则.方法 收集北京协和医院2008年11月至2010年10月1 714份中段尿标本,其中1 300份用于建立复检规则,214份用于验证所建立的规则,另外200份健康体检者的标本用于建立UF-1000i尿流式分析仪的参考范围.所有标本通过Siemens Bayer Clinitek 500型干化学分析仪、Sysmex UF-1000i尿流式分析仪及尿沉渣显微镜(简称尿沉渣)检测,进行RBC、WBC、PRO及CAST分析.针对自动化尿常规的不同检测方法,设计了4种复检方案:(1)方案1:单独使用干化学时RBC、WBC和PRO任何一项参数出现阳性者;(2)方案2:单独使用尿流式时RBC、WBC和CAST任何一项参数超出参考范围上限者;(3)方案3:联合使用2种方法检出的WBC结果不相符合,即同一项参数在一台仪器上检测为阳性或超出参考范围上限,在另一台仪器上检测为阴性或不超出参考范围上限,而RBC、PRO(对应尿流式的CAST)中任何一项参数在任何一台仪器上出现阳性或超出参考范围上限者;(4)方案4:联合使用2种方法检出的RBC、WBC、PRO(对应尿流式的CAST)结果不相符合者.通过Sysmex Laboman UriAccess Ver 3.0软件进行统计分析,建立不同检测方法的自动化尿常规分析的复检规则.结果 UF-1000i尿流式分析仪的参考范围:RBC为0～7.5个/μl(男)、0～15.9个/μl(女);WBC为0～11.6个/μl(男)、0～12.7个/μl(女);上皮细胞为0～6.5个/μl(男)、0～21.4个/μl(女);CAST为0～1.3个/μl.尿沉渣显微镜镜检结果显示,1 300份用于建立复检规则的标本中,阳性标本占47.46%(617/1 300),阴性标本占52.54%(683/1 300).在阳性标本中,RBC阳性者最多,占60.13%(371/617),其次为CAST阳性者,占8.43%(52/617).4种方案的假阴性率(漏诊率)分别为8.38%(109/1 300)、4.69%(61/1 300)、0.62%(8/1 300)和0.54%(7/1 300);复检率分别为47.85%(622/1 300)、59.38%(772/1 300)、72.85%(947/1 300)及52.23%(679/1 300);方案4的漏诊病例中无1例血肌酐结果异常.采用214份临床标本对所建立的复检规则(方案4)进行验证,其漏诊率为0,复检率为53.74%(115/214).结论 方案4的漏诊率最低,复检率也较低,且无严重肾功能异常者漏诊,是理想的复检方案.

Abstract：

Objective To integrate urine strip chemistry analysis with urine sedimental analysis and set up the criteria for urine microscopy review following automated urine analysis.Methods A total of 1 714 urine samples were collected from Peking Union Medical College Hospital from November 2008 to October 2010.Out of 1 714 samples, 1 300 samples were used for the establishment of review criteria, and 214 samples were used for criteria verification.The other 200 samples from healthy donors were used to set up the normal reference range of fully automated urine sedimental analyzer UF-1000i.RBC,WBC,PRO and CAST in all the samples were measured by Siemens Bayer Clinitek 500 urine strip chemistry analyzer, Sysmex UF-1000i urine sedimental analyzer and microscopic examination.Based on the different laboratory automation in urine analysis, four microscopic review protocols were defined: (1) Protocol 1: based on chemistry results only, microscopy review was performed when any of WBC, RBC and PRO was positive; (2) Protocol 2: based on fully automated sedimental analyzer only,microscopy review was performed when any of WBC, RBC and CAST was over the upper limit of the reference range; (3) Protocol 3: All the results of urine chemistry analyzer and sedimental analyzer were integrated.If two WBC results were different between two systems (in one system WBC was positive or over the upper limit of the reference range but in another system WBC was negative or within the reference range), and any of RBC, PRO/CAST was positive or over the upper limit, microscopic review was performed; (4) Protocol 4: if any of WBC, RBC, PRO/CAST was different between two systems, microscopic review was performed.Review criteria were performed with Sysmex Laboman UriAccess 3.0 software.Results The reference ranges of UF-1000i parameters were RBC 0-7.5/μl (male), 0-15.9/μl (female); WBC 0-11.6/μl (male), 0-12.7/μl (female); Epithelial cell were 0-6.5/μl (male), 0-21.4/μl (female); CAST 0-1.3/μl.The results of microscopic examination revealed that positive samples were 47.46% (617/1 300) and negative samples were 52.54% (683/1 300). Among positive samples, majority showed the presence of RBC (60.13%,371/617), followed by CAST (8.43%,52/617).The false negative rates of four protocols were 8.38% (109/1 300), 4.69% (61/1 300), 0.62% (8/1 300) and 0.54% (7/1 300), respectively.The review rates were 47.85% (622/1 300), 59.38% (772/1 300), 72.85% (947/1 300) and 52.23% (679/1 300), respectively.Although there were false negative cases in protocol 4, all the patients had normal serum creatine level.In those 214 patients for verification, the false negative rate using protocol 4 was zero, the review rates were 53.74% (115/214).Conclusions Protocol 4 shows lest false negative rate and lower review rate.Importantly, there was no patients with serious renal function abnormality missed using protocol 4.Therefore, protocol 4 is an ideal criteria for microscopy review following automated urine analysis.     

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.     

尿液中含有精子对检测结果的影响

目的探讨尿液中含有精子对检测结果的影响。方法用UF-50全自动尿沉渣分析仪、H-500尿液分析仪与显微镜对100例未含精子组尿液标本和含精子组尿液标本进行检测并对结果进行分析。结果含精子组尿液尿蛋白出现假阳性。当尿液中精子数大于或等于60/μL,尿白细胞数(WBC-U)、尿白细胞(WBC-HP)、尿红细胞数(RBC-U)、尿红细胞(RBC-HP)出现假阳性。未含精子组尿液标本与尿液中精子数大于或等于60/μL含精子组尿液标本的WBC-U、WBC-HP比较差异有统计学意义(P<0.05),RBC-U、RBC-HP两者比较差异有显著统计学意义(P<0.01)。结论应杜绝精子混入尿液中,提高尿液的检测质量。     

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...     

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-500i尿沉渣分析仪尿路感染筛检作用评价

目的评价UF-500i尿沉渣分析仪筛检尿路感染的价值。方法收集500份清洁中段尿液标本采用UF-500i尿沉渣分析仪和尿定量培养方法检测细菌及真菌,以尿定量培养方法为金标准计算UF-500i的灵敏度、特异性、阳/阴性预测值和假阳性/假阴性率和准确率。结果尿培养阳性率为57.4%,最常见的分离菌为大肠埃希菌。UF-500i尿沉渣分析仪灵敏度、特异度、假阳性/假阴性率、阳/阴性预测值和准确率分别为85.02%、82.63%、17.3%、14.98%、86.83%、80.37%、84.0%;男性和女性灵敏度、特异度和准确率分别为93.91%/79.07%,90.22%/76.86%,92.27%/78.15%;革兰阴性杆菌、革兰阳性球菌和真菌的敏感度分别为88.8%、82.2%和75.0%。结论 UF-500i尿沉渣分析仪在尿路感染早期筛检中具有重要作用,性别和感染微生物的种类影响筛检效果。     

Case–control time course study of urinary leukocyte and bacterial counts in patients with acute urinary tract infections responsive and not responsive to antibacterial therapy

BackgroundUrinary tract infections (UTIs) are usually diagnosed by urine particle detection and urine bacterial culturing, but an empiric treatment is often prescribed before the microbiological results are known. The aim of this study was to assess whether quantification of bacteriuria and leukocyturia could predict the outcome of empiric antibiotic therapy.MethodsBy using a Sysmex UF-100 analyser, we performed a case–control study in which bact channel counts (BCCs) and leukocyte (WBC) quantification were compared in urine samples obtained from responsive patients (RPs) and non-responsive patients (NRPs) at diagnosis (t0) and 24 h (t24) after the start of empiric antibacterial treatment.ResultsBCCs decreased significantly from t0 (median: 30,000 E6/L) to t24 (median: 700 E6/L; p < 0.001) in RPs but not in NRPs (median at t0 31,000 E6/L, and 23,000 E6/L at t24; p > 0.05). Similarly, WBC counts were reduced in RPs at t24 relative to the initial values (p < 0.001) but not in NRPs. A reduction of 70% in the BCC count or 60% in the WBC count of paired samples was useful for discriminating between RPs and NRPs.ConclusionsOur results suggest that quantitative time course analysis of urine BCCs and WBCs can be used to predict the success of first-line empiric treatment for UTIs.