尿液不同检测方法对泌尿系统感染的诊断价值

目的:观察尿有形成分分析及干化学分析筛查泌尿系统感染的价值.方法:留取130例尿路感染患者中段尿标本,应用培养法进行细菌计数和鉴定,应用UF-1000i尿有形成分分析仪检测细菌计数和WBC,应用H-100MA尿干化学分析仪测定白细胞酯酶和亚硝酸盐.以中段尿定量细菌培养结果为标准,比较尿有形成分分析及干化学分析诊断尿路感...     

尿液不同检测方法对泌尿系统感染的诊断价值

目的:观察尿有形成分分析及干化学分析筛查泌尿系统感染的价值.方法:留取130例尿路感染患者中段尿标本,应用培养法进行细菌计数和鉴定,应用UF-1000i尿有形成分分析仪检测细菌计数和WBC,应用H-100MA尿干化学分析仪测定白细胞酯酶和亚硝酸盐.以中段尿定量细菌培养结果为标准,比较尿有形成分分析及干化学分析诊断尿路感染的准确率.结果:培养法检出细菌阳性标本954份(73.1%),分离出细菌102株.尿干化学分析和尿有形成分分析检测结果中分别有49份和83份为阳性,阳性率分别为37.7%和63.8%.结论:诊断尿路感染需做细菌培养,尿有形成分分析和干化学分析参数不能作为诊断尿路感染的依据,可用于尿路感染治疗时动态监洲.     

尿常规和尿细菌培养联合检测在泌尿系疾病中的应用价值

目的讨论尿干化学中的白细胞酯酶和尿亚硝酸盐与尿沉渣细菌计数及白细胞在诊断泌尿系疾病中的作用,建立准确快速并且适合该地区的诊断依据。方法收集2015年1~8月在该院泌尿外科住院及门诊尿标本共计976例。分别检测白细胞酯酶及亚硝酸盐和尿沉渣细菌计数,并且对阳性标本进行尿细菌培养和鉴定。结果在976例标本中,尿细菌培养阳性结果为318例,阳性率为32.6%。革兰阴性菌176例占55.35%,其他细菌142例占44.65%。尿干化学的白细胞酯酶、亚硝酸盐与尿沉渣中细菌、白细胞假阳性率4.32%~11.49%,假阴性率20.24%~25.39%,特异度86.12%~95.73%,敏感度32.13%~39.43%,阴性预测值65.87%~71.79%,阳性预测值56.25%~77.17%。结论尿干化学亚硝酸盐与尿沉渣细菌计数联合检测可初步判断泌尿系疾病,尿细菌培养与上述两种方法联合检测更能准确诊断疾病。     

尿有形成分分析仪与尿路感染的实验研究

目的：评价UF－100细菌定量计数在尿路感染诊断中的价值。方法：226例病人的清洁中段尿标本分别做细菌培养，UF－100尿细菌计数和尿干化学试带检测。结果：与中段尿培养相比，UV－100细菌数＞8000个／μl时，诊断尿路感染的敏感度为63．08％，特异性为94．41％，阳性预示值为82％，阴性预示值为86．36％，准确度为85．40％，结论：UF－100能快速，直接对计数细菌，是尿路感染筛检的良好方法。     

尿流式有形成分及干化学分析在孕晚期妇女尿路感染中的应用

目的探讨尿流式有形成分及干化学分析在孕晚期妇女尿路感染(Urinary tract infection,UTI)中的诊断效能及临床应用价值。方法按尿流式有形成分分析仪厂家提供的UTI阳性标准收集孕晚期妇女尿液标本908份。以中段尿培养为金标准,使用四格表计算亚硝酸盐对孕晚期妇女尿路感染的诊断效能,使用受试者工作特征曲线(Receiver operating characteristic curve,ROC曲线)分析尿流式细菌计数的最佳截断值(Cut-off Values)及其诊断效能。并评价上述两项指标联合使用对孕晚期妇女尿路感染的临床应用价值。结果当亚硝酸盐为阳性或尿流式细菌计数≥4794/μl时,其对孕晚期妇女尿路感染的诊断灵敏度为灵敏度为89.5%,诊断特异度为81.7%,阳性预测值为30.9%,阴性预测值为98.8%。然而,当亚硝酸盐为阳性且尿流式细菌计数≥4794/μl时,其对孕晚期妇女尿路感染的灵敏度为64.3%,特异度为98.6%,阳性预测值为75%,阴性预测值为95.3%。结论尿液干化学亚硝酸盐指标联合尿流式流式细菌计数结果对孕晚期妇女尿路感染的诊断具有较高的临床应用价值,可以有效的诊断和排除诊断孕晚期妇女尿路感染性疾病。     

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.     

流式尿沉渣分析仪、尿干化学分析仪检测尿红、白细胞的分析研究

目的探讨流式尿沉渣定量分析仪、尿干化学分析仪及尿沉渣定量计数在尿液常规分析中的临床应用价值.方法随机选取我院521例住院患者晨尿标本,分别用AX-4280尿干化学分析仪、IQ-200尿沉渣定量分析仪及Dia Sys沉渣定量系统进行检测,分析多个参数结果.结果 （1）三种方法对尿液中红、白细胞的检出率较一致.（2）三种方法对红细胞检测敏感度略高于白细胞的敏感度.（3）流式尿沉渣定量分析与干化学法结合能大大提高对红细胞、白细胞检测的敏感度.结论流式尿沉渣定量分析与干化学分析仪敏感度较高,两者联合应用具有较高的准确性和敏感度,能提高工作效率.     

联合UF-100型尿沉渣分析仪和尿干化学分析诊断尿路感染的研究

目的：探讨联用UF-100型全自动尿沉渣分析仪和尿干化学分析诊断尿路感染的临床应用价值。方法：用UF-100和干化学分析仪检测110份洁净中段尿中的白细胞、细菌和白细胞酯酶、亚硝酸盐，110份标本都作尿细菌培养，比较结果。用配对资料的X^2检验评价UF-100联合干化学法与定量尿细菌培养的一致程度并评价其敏感性、特异性和准确率。结果：UF-100和干化学联合检测与定量尿细菌培养结果比较无明显差异。敏感性是76．1％，特异性是93．5％，准确率是86．4％。结论：UF-100和干化学联合可以作为诊断尿路感染的重要辅助指标。     

尿有形成分分析仪与尿路感染的实验研究

目的评价UF-100细菌定量计数在尿路感染诊断中的价值.方法 226例病人的清洁中段尿标本分别做细菌培养、UF-100尿细菌计数和尿干化学试带检测.结果与中段尿培养相比,UF-100细菌数>8000个/μl时,诊断尿路感染的敏感度为63.08%,特异性为94.41%,阳性预示值为82%,阴性预示值为86.36%,准确度为85.40%.结论 UF-100能快速、直接的计数细菌,是尿路感染筛检的良好方法.     

UN2000尿液全自动化流水线系统和中段尿培养检测在尿路感染诊断中的应用

目的 分析UN2000尿液全自动化流水线系统(由UC3500尿干化学分析仪和UF5000尿沉渣分析仪组合而成)和中段尿培养检测在尿路感染(UTI)诊断中的应用价值.方法 收集2020年1-12月该院180例疑似UTI患者的中段尿标本进行回顾性分析,每例患者的标本均分为两份,一份采用中段尿培养,另一份应用UN2000尿液全自动化流水线系统测定尿白细胞酯酶(LEU)、亚硝酸盐(NIT)、白细胞计数(WBC)、细菌计数(BACT)、细菌分型(BACT-info)、真菌感染情况,对两种方法进行对比,并绘制受试者工作特征(ROC)曲线分析LEU、NIT、WBC及BACT诊断UTI的价值.结果 180份中段尿标本中,培养结果为阴性100例(55.56％)、杂菌生长24例(13.33％)、培养结果为阳性56例(31.11％),阳性者中有2例为2种细菌混合感染.共检出阳性菌株58株,其中革兰阳性菌、革兰阴性菌、真菌分别占25.86％、60.35％、13.79％;以中段尿培养结果为"金标准",56例阳性标本中,UF5000检出革兰阳性菌11株、革兰阴性菌29株、真菌6株,UF5000鉴定的革兰阳性菌、革兰阴性菌、真菌符合率分别为80.00％(12/15)、91.43％(32/35)、75.00％(6/8),总符合率为86.21％(50/58).ROC曲线分析发现,NIT+WBC+BACT诊断UTI的曲线下面积最大,为0.849,灵敏度、特异度、准确度分别为0.86、0.62、0.74,其中WBC、BACT的截断值分别为63.88×109/L、407.42/μL.结论 UN2000尿液全自动化流水线系统和中段尿培养检测在UTI诊断中有较高价值,其中UN2000测得的NIT、WBC、BACT诊断价值最高.     

The uristatin dipstick is useful in distinguishing upper respiratory from urinary tract infections

BACKGROUND: We determined the diagnostic value of the trypsin inhibitor, uristatin, that is commonly found in urine and plasma in patients with infections or inflammations of any kind. METHODS: We collected urine specimens from patients with infections of the urinary or upper respiratory tract and from healthy controls. We also collected blood from patients with a likely upper respiratory tract infection and healthy controls. A bacterial count of >10(5) organisms/ml in urine was considered to represent infection rather than contamination. RESULTS: The uristatin dipstick test in urine showed acceptable negative predictive values (NPV of up to 93%) for patients without infection or inflammation. Here, the dipsticks could eliminate some urine cultures. For those with infection or inflammation, the positive predictive values (PPV) of the dipsticks were lower (up to 57%). Including the leukocyte esterase and nitrite values increased the PPV of the dipsticks for those with disease. CONCLUSIONS: The uristatin strip was more accurate than the leukocyte and nitrite dipsticks for predicting upper respiratory infections (URI) and C-reactive protein for those with infection or inflammation. The uristatin dipstick was able to detect both the bikunin and uristatin inhibitors.     

Diagnostic value of various urine tests in the Jordanian population with urinary tract infection.

We compared the performance of leukocyte esterase and nitrite reductase dipstick tests with microscopic examination and uroculture in cases with clinically suspected urinary tract infection (UTI). We studied urine specimens from 504 Jordanian patients which were obtained by the mid-stream clean catch method and analyzed for bacteria. All samples were subjected to culture. Results of urine dipstick tests and pyuria (white blood cells (WBC)/high power field) were compared with urine culture for each sample. Significant bacteriuria was found in 117 cases (23.2%) with positivity of 59% and 68.5% for the presence of nitrite reductase and leukocyte esterase, respectively. Echerichia coli was the most common organism isolated. The dipstick leukocyte esterase and nitrite testing had a sensitivity of 68.5% and 59% for detecting bacteriuria in UTI cases and specificity of 73.5% and 78%, respectively. The positive predictive value of the tests was 44% and 60%, and the negative predictive value 88.5% and 86.2%, respectively. Microscopic WBC showed 86.5% specificity but low sensitivity. Urine dipstick results and pyuria significantly correlated with the results of urine culture but demonstrated more false-positive results, which ranged from 13.4-26.6%. The probability of growing a urinary pathogen correlated with urinary WBC counts and allowed prediction of the presence or absence of bacteriuria by counting urinary leukocytes. A combination of pyuria and urine dipstick testing appears to be a very useful marker for the diagnosis of UTI. Urine culture can be omitted if both tests are negative.     

Improved urine screening using a combination of leukocyte esterase and the Lumac system

Three rapid urine screening tests, leukocyte esterase, nitrite, and the Lumac System for detection of bacterial ATP, were evaluated alone and in combination to determine their utility in screening urine specimens from male patients for bacteruria. The combination of leukocyte esterase and Lumac testing resulted in significant improvement in the sensitivity of urine screening over each test individually and the combination of leukocyte esterase and nitrite. The leukocyte esterase/Lumac combination detected 98% of those specimens with greater than or equal to 10(5) CFU/ml and had a negative predictive value of 99%. The results obtained from this type of testing can be used with confidence to minimize the number of urine specimens cultured and to provide rapid reporting of negative results.     

Use of the leukocyte esterase and nitrite tests to determine the need for culturing urine specimens from a pediatric and adolescent population

Using a commercially available dip stick 601 urine specimens were screened for leukocytes and bacteria by testing for the presence of leukocyte esterase and nitrite. The screening method was found to have a sensitivity of 88.7% and a predictive value of negative results of 98.5%.     

联合检测中性粒细胞与白蛋白比值和乳酸对脓毒性休克患者早期预后的评估价值

目的探讨中性粒细胞与白蛋白比值（NAR）和乳酸对脓毒性休克患者28 d死亡的预测价值。 方法回顾性分析2017年10月至2019年10月南京市第一医院ICU收治的118例脓毒性休克患者的临床资料,记录所有患者的年龄、性别、体质量指数（BMI）、急性病生理学和长期健康评价（APACHE）Ⅱ评分、序贯器官衰竭估计（SOFA）评分、C反应蛋白质（CRP）、降钙素原、NAR、白细胞计数、红细胞分布宽度（RDW）、乳酸、住ICU时间、机械通气时间、行连续肾脏替代疗法（CRRT）、肺部感染、腹腔感染、泌尿系感染、血行感染和28 d死亡情况。将上述因素纳入单因素Logistic回归分析,初步筛选出相关的影响因素,再纳入多因素Logistic回归分析,得到影响脓毒性休克患者28 d死亡的独立危险因素;采用受试者工作特征（ROC）曲线分析NAR、乳酸及两者联合对脓毒性休克患者28 d死亡的预测价值,并用Z检验比较曲线下面积（AUC）。 结果经单因素Logistic回归分析,初步筛选出影响脓毒性休克患者28 d死亡的9个因素,包括男性[比值比（OR）= 0.345,95%置信区间（CI）（0.603,3.357）,P = 0.004]、SOFA评分[OR = 1.183,95%CI（1.036,1.350）,P = 0.013]、NAR [OR = 2.849,95%CI（1.487,5.457）,P = 0.002]、乳酸[OR = 1.275,95%CI（1.108,1.467）,P = 0.001]、机械通气时间[OR = 0.254,95%CI（1.025,1.223）,P < 0.001]、行CRRT [OR = 4.585,95%CI（1.737,12.100）,P = 0.002]、存在肺部感染[OR = 0.282,95%CI（0.898,4.732）,P < 0.001]、存在腹腔感染[OR = 0.460,95%CI（0.392,1.989）,P = 0.002]、存在泌尿系感染[OR = 0.464,95%CI（0.201,2.195）,P < 0.001]。将上述影响因素纳入多因素Logistic回归分析,结果显示,NAR [OR = 4.424,95%CI（1.427,13.717）,P = 0.010]、乳酸[OR = 1.267,95%CI（1.008,1.594）,P = 0.043]、机械通气时间[OR = 1.168,95%CI（1.007,1.356）,P = 0.041]、行CRRT [OR = 5.148,95%CI（1.069,24.794）,P = 0.041]是脓毒性休克患者28 d死亡的独立危险因素。ROC曲线分析结果显示,NAR [AUC = 0.676,95%CI（0.572,0.780）,P = 0.001]、乳酸[AUC = 0.696,95%CI（0.592,0.800）,P < 0.001]及NAR和乳酸联合[AUC = 0.759,95%CI（0.699,0.850）,P < 0.001]均对脓毒性休克患者28 d死亡具有预测价值,且NAR和乳酸联合的AUC显著高于NAR（Z = 2.110,P = 0.035）及乳酸（Z = 1.991,P = 0.047）。 结论NAR和乳酸对脓毒性休克患者28 d死亡有一定的预测价值,且两者联合能够提高预测价值。     

自身免疫性脑炎短期预后不良的危险因素及其预测价值

目的:分析自身免疫性脑炎（AE）患者短期预后的危险因素,并评估其预测价值。方法:收集2016年3月至2021年1月于福建医科大学附属第一医院及福建省神经医学中心诊治的81例AE患者资料进行回顾性分析。根据患者出院时的临床表现,采用改良Rankin评分量表（mRS）将AE患者分为预后良好组（mRS≤2分,48例）和预后不...     

单管10色流式细胞术分类计数外周血白细胞

目的 应用"单管10色"流式细胞术分类计数外周血白细胞,并探讨其临床应用价值.方法 通过多种单克隆抗体的选择和多重逻辑设门的研究,确定了10色流式细胞术与12种单克隆抗体组合的单管免洗外周血白细胞分类方法(简称"单管10色"方法).选取142份外周血标本,以血涂片显微镜法分类技术为参考方法,同时用Beckman Cotdter LH750全自动血细胞分析仪和"单管10色"方法分类计数白细胞,计算"单管10色"方法的临床诊断效率,并统计分析两种方法与显微镜法分类计数白细胞的相关性.以BD FACS Calibur流式细胞仪免疫分型结果为标准,计算"单管10色"流式细胞术检出原始细胞的诊断效率.结果 "单管10色"流式细胞术与显微镜法分类计数外周血白细胞除嗜碱粒细胞外均具有良好的相关性(r均>0.700,P均<0.01),其中对检出中性粒细胞、淋巴细胞、未成熟粒细胞和原始细胞的相关性较高(r＝0.972、0.951、0.801、0.912,P均<0.01).以显微镜法分类计数外周血未成熟粒细胞1%为临界值,"单管10色"流式细胞术检出未成熟粒细胞敏感度为92%(57/62),特异度为79%(63/80).以显微镜法检出外周血原始细胞0.5%为临界值,"单管10色"流式细胞术检出原始细胞敏感度为99%(67/68),特异度为92%(68/74).以BD FACSCalibur流式细胞仪免疫分型结果为标准,"单管10色"流式细胞术对原始细胞检出的敏感度为100%(40/40),特异度为91%(10/11),阳性预测值为98%(40/41),阴性预测值为100%(10/10),准确性为98%(50/51).结论 "单管10色"流式细胞术分类计数外周血白细胞与显微镜法具有良好的相关性,有望用于全血细胞计数异常时的后续检验.

Abstract：

Objective To explore the values of potential clinical application of"single tube/ten colors"flow cytometry for leukocyte differential count in peripheral blood.Methods Utilizing multiple monoclonal antibody combinations and the vavious logical gating strategies,the single tube/12 antibodies with no-wash method for the leukocyte differential count in peripheral blood were determined by using 10 colors flow cytometry.Leukocyte differentials of 142 peripheral blood samples were determined by both Beckman-Coulter LH750 hematology analyzer and 10 colors flow cytometry.The results were then compared to standard microscopic examination as a reference method.The clinical diagnostic efficiency of"single tube/10 colors"flow cytometry was calculated.The correlations between standard microscopic cytology,"single tube/10 colors"flow cytometry and the hematology analyzer were determined.In addition,the clinical diagnosis efficiency for blast counts of"single tube/10 colors"were compared to the results determined by BD FACS Calibur flow cytometer.Results The leukocyte differentials were correlated well between the "single tube/10 colors"flow cytometry and standard microscopic cytology(r>0.700,P<0.01) except for basophils.The correlations with neutrophilic granulocytes,lymphocytes,immature granulocytes and blasts were superior(r=0.972,0.951,0.801,0.912,respectively,P<0.01).When 1% was selected as the cut-off point for immature granulocytes determined by standard microscopic cytology,the sensitivity and the specificity of"single tube/10 colors"flow cytometry were 92%(57/62) and 79% (63/80),respectively.When 0.5% was selected as the cut-off point for blasts detected by standard microscopic cytology,the sensitivity and the specificity were 99% (67/68) and 92% (68/74).Using the immunophenotyping results from BD FACS Calibur as a standard,the sensitivity for detecting blasts by"single tube/10 colOrs"flow cytometry was 100% (40/40),the specificity was 91% (10/11),the positive predictive value was 98% (40/41),the negative predictive value was 100% (10/10) and the accuracy was 98% (50/51).Conclusions The"single tube/10 colors"flow cytometry has a excellent correlation with the standard microscopic cytology when applied on leukocyte differential count in peripheral blood.It may potentially use as a subsequent method for verification of abnormal results of complete blood cell count in the future.     

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.     

尿液干化学分析与UF-100联用在判断尿液细菌培养结果中的价值

目的 探讨尿液干化学分析仪与UF-100尿液分析仪结果联合使用在判断尿液细菌培养结果中的临床意义。方法 使用尿液干化学分析仪与UF-100检测133份尿液进行检验，同时进行尿液细菌定量培养，以细菌定量培养结果为金标准，判断尿液亚硝酸盐，白细胞及UF-100细菌定量计数对判断泌尿系统感染的灵敏度、特异性等。结果 尿液亚硝酸盐对泌尿系统感染判断的灵敏度为36．3％，特异性为88％，阳性预计值为50％，阴性预计值为80．7％，准确率为75．2％，白细胞对泌尿系统感染判断的灵敏度为93．9％，特异性为38％，阳性预计值为33．3％，阴性预计值为95％，准确率为51．9％，细菌定量计数对判断泌尿系统感染的灵敏度为39．4％，特异性为84％，阳性预计值为44．8％，阴性预计值为80．7％，准确率为72．9％。采用多项目联合可提高阴性预期值。结论 联合使用尿液干化学分析仪与UF-100尿液分析仪对临床尿路感染筛检时的灵敏度及特异性均不理想，但可利用其阴性预期值高的特点对检验结果阴性的标本进行筛检以减少无效劳动。     

Comparison of three automated urinalysis systems--Bayer Clinitek Atlas, Roche Urisys 2400 and Arkray Aution Max for testing urine chemistry and detection of bacteriuria

BACKGROUND: Our study is aimed to determine the performance of 3 automated urinalysis systems-Clinitek Atlas, Urisys 2400 and Aution Max. METHODS: One thousand urine specimens were analyzed with the 3 automated systems. The results of the 3 assays were compared for testing urine chemistry and evaluating the capacity of leukocyte esterase and nitrite to detect bacteriuria. RESULTS: The correlation between the 3 instruments represented as within 1 grading difference was better between the Atlas and Aution Max systems for pH, blood, glucose, urobilinogen, ketone and specific gravity. For protein and nitrite, better correlation was observed between the Atlas and Urisys 2400, while the Aution Max and Urisys 2400 conveyed better correlation for bilirubin and white blood cells. The sensitivity and specificity of both the leukocyte esterase and nitrite in screening for significant bacteriuria were 71.7, 58.9, 70.8% and 99.1, 99.1 and 97.2%, for the Clinitek Atlas, Aution Max and Urisys 2400, respectively. CONCLUSIONS: The automated urinalysis systems demonstrate acceptable correlations with each other in urine chemistries, especially between the Clinitek Atlas and Aution Max systems on the majority of items. The specificity and negative predictive value of leukocyte esterase and nitrite of the 3 instruments for screening of significant bacteriuria were sufficient to avoid unnecessary urine culture.