MEK-7222K血细胞分析仪器性能评价

目的评估MEK-7222K血细胞分析仪的各项性能参数是否符合相关要求,能否应用临床。方法以MEK-7222K血细胞分析仪作为评价仪器,分别进行空白检测、批内和批间精密度测试、携带污染率测试、线性验证,并将MEK-7222K血细胞分析仪全血白细胞计数结果与显微镜手工分类计数结果进行比对,评估仪器的测量准确度。结果仪器的空白值、批内精密度、批间精密度、携带污染率均满足要求;线性验证通过;白细胞分类合格率满足白细胞分类计数准确度的要求。结论 MEK-7222K血细胞分析仪的各项性能参数符合要求,可应用于临床。     

全自动血细胞分析仪与手工计数法测定嗜酸性粒细胞的比较

目的评价MEK-8222J／K型和BeckmanCoulterLH750型全自动血细胞分析仪对嗜酸性粒细胞测定的临床应用价值。方法选取湖北省中医院2012年2月～7月住院患者100例,用直接计数法、间接计数法、MEK-8222J／K型和BeckmanCoulterLH750型血细胞分析仪分别对其中3份标本进行精密度测定,并对所有标本进行准确度测定。结果直接计数法、间接计数法、MEK-8222J／K型和BeckmanCoulterLH750型细胞分析仪对3份标本的测定结果的批内平均CV％分别为6．66％,7．78％,5．83％和4．79％。间接计数法、MEK-8zzzj／K型和BeckmanCoulterLH750型血细胞分析仪对100份标本的测定结果与直接计数法经配对t检验,t值分别为1．125,0．463和0．116,均小于t0．05．100,P〉0．05,三种方法与直接计数法的差异均无统计学意义。结论实验结果表明MEK-8222J／K型和BeckmanCoulterLH750型血细胞分析仪对嗜酸性粒细胞的分析具有良好的准确度和精密度,并且检测速度快。因此,嗜酸性粒细胞在检出限以上时可以用全自动血细胞分析仪替代手工计数法进行测定。     

MEK-8222k血细胞分析仪性能验证及评价

目的评价MEK-8222k血细胞分析仪的主要性能。方法通过本底检测、准确度、精密度、携带污染率、线性范围及WBC分类的重复性、正确度、异常标本的报警等试验对MEK-8222k血细胞分析仪性能进行验证。结果 MEK-8222k血细胞分析仪的本底值低,WBC、RBC、Hb、HCT、PLT的批内、批间精密度均在允许范围以内,携带污染率低,准确度高,线性范围良好,WBC分类与显微镜分类的相关性随细胞种类有差异。结论 MEK-8222k全自动血细胞分析仪各方面性能良好,符合实验室血细胞分析仪的性能要求,适用于临床血细胞分析的检验。     

MEK-7222型全自动血细胞分析仪计数血小板的影响因素分析

目的:分析MEK-7222型全自动血细胞分析仪计数血小板的影响因素。方法:使用MEK-7222型全自动血细胞分析仪在不同条件下对血小板进行测定,并在血小板直方图出现异常时采用手工镜检法计数,两者作对比分析。结果:采用MEK-7222型全自动血细胞分析仪测定血小板,放置10min血小板数显著高于即刻血小板数(P<0.05),之后10min^4h血小板数无显著性变化(P>0.05),放置8h后,血小板数显著低于放置10min血小板数(P<0.05)。采用手工镜检法测定血小板,即刻血小板数与放置10min^4h血小板数无显著性变化(P>0.05),放置8h后血小板数显著降低(P<0.05)。平均红细胞体积(MCV)>70fl时,血细胞分析仪与镜检法血小板计数结果比较,差异无统计学意义(P>0.05);MCV<70fl时,血细胞分析仪血小板计数显著高于镜检法计数(P<0.05)。结论:MEK-7222型全自动血细胞分析仪计数血小板的准确性与标本放置时间、平均红细胞体积的大小有关,必要时可进行重新采血或手工计数。     

改良法检测羊水板层小体在预测胎儿肺成熟度中的作用

目的探讨羊水板层小体计数在预测胎儿肺成熟度中的意义。方法利用血细胞计数仪检测147例孕妇非离心羊水标本板层小体数值,由新生儿科医生对新生儿进行呼吸窘迫综合征(RDS)评价,分析羊水板层小体计数与新生儿RDS的关系。结果判定胎儿肺成熟度的羊水板层小体的界值为45×103/μl,阳性预侧值83.3%,阴性预侧值100%,灵敏度为100%,特异度88.9%。结论非离心羊水板层小体计数可以作为临床预测胎儿肺成熟度的指标,操作简便、快速,适宜临床推广。     

Sysmex XS-800i全自动血细胞分析仪检测新生儿单核细胞计数性能的评价

目的 探讨Sysmex XS-800i全自动血细胞分析仪检测新生儿单核细胞计数结果的准确性.方法 随机抽取300份经EDTA-K2抗凝静脉全血,在Sysmex XS-800i全自动血细胞分析仪上检测后制成血涂片在显微镜下进行分类计数,将仪器法与手工法结果进行比较.结果 300例标本经显微镜手工分类和血细胞分析仪检测新生儿单核细胞时,仪器检测结果明显高于手工法检测结果,差异有统计学意义(P＜0.001).结论 仪器分类计数单核细胞结果不可靠,均应用手工分类加以纠正.     

重型肝病患者对不同血球仪白细胞计数的影响

目的 探讨重型肝炎患者对不同血细胞分析仪白细胞计数(WBC)的影响.方法 分别采用国贝克曼库尔特公司生产的GENS-2型血细胞分析仪(简称GENS-2),迈瑞公司生产的BC5300型血细胞分析仪(简称BC5300)(仪器法)和显微镜目测(手工法)对58例重型肝炎患者(肝病组)与60例正常对照人群(对照组)进行WBC对比分析.结果 对照组仪器法和肝病组BC5300仪器法与手工法WBC检测结果的差异无统计学意义(P＞0.05),肝病组GENS-2仪器法与手工法WBC检测结果的差异有统计学意义(P＜0.01).结论 重型肝炎患者红细胞膜质类异常,对不同计数原理的血细胞分析仪影响不同,应进行显微镜目视复测,以保证WBC检测结果的准确性.     

三分类血细胞分析仪与血液涂片镜检分类500例结果分析

材料与方法。1．仪器：日本光电MEK-6108K血液细胞分析仪、日本OLYMPUS显微镜、血细胞分类计数器。     

MEK-8222K激光五分类血细胞分析仪的保养及常见故障分析

<正>日本光电MEK-8222K型血细胞分析仪是一个可以检测包括WBC五分类在内的22项参数的精密仪器。它能进行快速计数(80个样本/h)并实现了包括取样在内的所有操作程序的自动化,样本微量化,2种取样模式能报告红细胞、白细胞、血小板的体积分布直方图,并可打印所有结果。血液分析仪的     

BC-5180全自动血细胞分析仪对低值血小板计数的准确性探讨

目的 探讨BC-5180全自动血细胞分析仪对低值血小板计数的准确性.方法 利用BC-5180全自动血细胞分析仪计数,选取100份血小板计数小于100×109/L的静脉血标本,同时用显微镜手工计数血小板.结果 手工法和仪器法有极显著性差异(P<0.01),均值以手工法偏高.结论 BC-5180对低值血小板计数的准确性较低,建议对低值血小板用显微镜手工计数或者其他抗干扰能力强的方法 复核.     

Determination of lamellar body size, number density, and concentration by differential light scattering from amniotic fluid: physical significance of A650

A new method for characterizing amniotic fluid is presented. The difference in optical absorbance between amniotic fluid diluted with distilled water or glycerol is measured. This differential approach is shown to determine the total light scattered by the surfactant-containing lamellar bodies and not to be affected by interfering chromogens. The lamellar body size, number density, and concentration are in turn quantified from the wavelength dependence of the absorbance difference, which is shown to be accurately predicted by light-scattering theory in the domain of "anomalous diffraction." The concentration of the lamellar bodies is demonstrated to be directly related to the absorbance difference at 650 nm. A maturity criterion, based on that generally accepted for the direct measurement of absorbance at 650 nm (that is, A650 greater than or equal to 0.15), is determined for the differential approach. Hence, measurement of the absorbance difference at 650 nm can be used to assess amniotic fluid both for its optical absorbance and its lamellar body concentration.     

Lamellar body phospholipid content of amniotic fluid: a possible index of fetal lung maturity

Lamellar bodies, produced by secretory cells in the alveolar epithelium, are the major source of surfactant phospholipid. As the fetal lung matures, the membranous content of the lamellar bodies is secreted into the alveolar spaces and passes into the amniotic fluid, from which it can be isolated in a morphologically recognisable form. A method is described for the rapid isolation of a lamellar body fraction from amniotic fluid using a small air-driven clinical ultracentrifuge. The lamellar body phospholipid content of amniotic fluid increases towards the end of gestation, but the time of onset and the rate of this increase show wide individual variation. Preliminary results suggest that the lamellar body phospholipid content of amniotic fluid may be a useful index of fetal lung maturity.     

Characterization of amniotic fluid lamellar bodies by resistive-pulse counting: relationship to measures of fetal lung maturity

Resistive-pulse counting studies of amniotic fluid lamellar bodies are presented and demonstrate a strong concordance with the predictions of accepted measures of fetal lung maturity. Uncentrifuged as well as centrifuged specimens could be evaluated, because cells and debris are rejected electronically. The technique is not affected by bilirubin or debris of lysed whole blood, and only mildly by meconium. Lamellar body number density and mean lamellar body volume were determined for 161 uncentrifuged and 241 centrifuged specimens. Number density maturity criteria (40,000/microL and 26,000/microL, respectively) were shown to be highly concordant with established measures of fetal lung maturity; mean lamellar body volume did not extend this concordance. Since electronic cell counters are generally available 24 h per day and the approach requires neither centrifugation nor subjective interpretation and is rapid and inexpensive, it is proposed that determining lamellar body number density by resistive-pulse counting may be a useful initial screen for the assessment of fetal lung maturity.     

Effect of albumin and lamellar bodies on fluorescence polarization of amniotic fluid

Using a probe and procedure developed for the Abbott TDx analyzer, we investigated the influence of albumin on fluorescence polarization of amniotic fluid. Polarization readings increased when albumin was added to either "mature" or "immature" amniotic fluids. Albumin added to a fraction rich in lamellar bodies (10,000 X g pellet) greatly increased polarization readings, but albumin added to the lamellar-body-free fraction resulted in only small increases. Adding increasing amounts of the lamellar-body-rich fraction from mature and immature pools to a constant amount of albumin decreased the polarization readings. We saw no correlation between amniotic fluid polarization and albumin concentration but found a significant correlation between polarization values and either total extractable phospholipids (r = 0.725, P less than 0.001) or the ratio albumin/total extractable phospholipids (r = 0.784, P less than 0.001). The concentration of albumin in amniotic fluid was variable and correlated poorly with gestational age.     

XE-5000血细胞分析仪血小板计数性能评价

目的评价Sysmex XE-5000血细胞分析仪对血小板(PLT)的检测性能。方法对XE-5000分别用电阻抗法和荧光法对血小板计数进行精密度、线性测试及干扰试验进行评估,并与显微镜计数法作对比试验。运用SPSS12.0对数据进行分析。结果平均批内精密度为PLT-I 1.30%、PLT-O 1.40%;批间精密度为PLT-I1.87%、PLT-O2.39%;携带污染率范围为PLT-I 0.00%~1.32%、PLT-O0.00%~1.17%;平均为PLT-I 0.44%和PLT-O0.33%;在线性稀释试验中低、中、高值与理论值的相关系数(r)分别为,PLT-I 0.991、0.997、0.997,PLT-O0.997、0.998、0.992;在RBC碎片干扰试验中,PLT-O对低值样本显示出较强的抗干扰能力(t=1.14,P>0.05),PLT-I与PLT-O测定血小板结果与PLT-M结果相关性良好。结论 Sysmex XE-5000对血小板计数具有精密度好、抗干扰能力强、重复性好、检测速度快等优点,是常规实验室测定血小板的较理想仪器。     

Evaluation of two-dimensional cytometric lamellar body counts on the ADVIA 120 hematology system for estimation of fetal lung maturation

Background: We sought to determine if the ADVIA® 120 hematology system (Bayer HealthCare LLC, Diagnostics Division, Tarrytown, NY), which employs a unique two-dimensional cytometric analysis approach for platelet (PLT) counting, might also be useful for estimation of LB lamellar body counts in amniotic fluid. Methods: ADVIA® 120 LB counts were performed on 217 amniotic fluid specimens, 88 of which were obtained within 72 h of infant delivery. The ADVIA® 120 LB count (ADVIA LB count) results were compared with results from other FLM tests, including the TDx-FLM II (FLM II) test (Abbott Diagnostics, Abbott Park, IL) and the A₆₅₀ estimate of lamellar body density using the refractive-index-matched anomalous diffraction (RIMAD) technique. Results: Use of an ADVIA LB count referent value of ≥35,400/μl to indicate maturity, yielded sensitivity, specificity, PV_RDS and PV_maturity of 100%, 67.6%, 36.8% and 100%, respectively, in our study population (prevalence of RDS=15.9%). The clinical performance of the ADVIA LB count assay was compared to that of the FLM II and RIMAD assays by predictive value and receiver operating characteristic (ROC) curve analysis. Conclusions: These data suggest that the ADVIA® 120-derived LB counts on amniotic fluid can be useful in predicting fetal lung maturity.     

胃肝样腺癌的超微结构诊断研究

本文对６例手术切除的胃肝样腺癌进行了光镜和电镜检查，结果表明肝样分化区的肿瘤细胞具有许多肝细胞癌特征，如胞质内胆汁，向心性环层小体，糖原颗粒及癌细胞间的毛细胆管。在扩张的粗面内质网池中的球形小体和细胞间的球形小体含有层状或纤维状结晶体。这些球形小体可能为光镜下所见的嗜酸性小体，含ＡＦＰ物质。     

Measurement of "lamellar body phospholipid" in amniotic fluid as a method for assessing fetal lung maturity

A simple, rapid micro-method, suitable for use in a routine clinical laboratory, is described for isolating a surfactant fraction from 0.1 mL of human amniotic fluid and measuring its phospholipid content. We determined the phospholipid content of this fraction, referred to as "lamellar body phospholipid," in 451 samples of amniotic fluid collected within two days of delivery and related the data to the respiratory performance of the newborn in every case; 112 of the infants were delivered at 28-37 weeks gestation. The incidence of hyaline membrane disease was inversely related to the concentration of lamellar body phospholipid in the amniotic fluid. Eleven of 12 infants with lamellar body phospholipid values less than 25 mg/L and four of 44 infants with lamellar phospholipid values between 25 and 50 mg/L developed hyaline membrane disease or other serious respiratory problems possibly related to lung immaturity, whereas all of 395 infants with lamellar body phospholipid values of 50 mg/L or more were free from respiratory problems of this nature. The incidence of transient tachypnea was greatest when the lamellar body phospholipid value was between 25 and 50 mg/L, suggesting that this condition may be related to a degree of lung maturity.     

Aberrant lamellar body counts noted on the Beckman Coulter Unicel DxH 800

Abstract Background: The lamellar body count (LBC) plays a crucial role in fetal lung maturity testing. Lamellar bodies are often counted in the platelet channel of routine hematology analyzers, resulting in a rapid and inexpensive assay for fetal lung maturity. Recently, significant imprecision was noted during LBC validation on the Beckman Coulter Unicel DxH 800. Methods: The results of two Beckman Coulter Unicel DxH 800 instruments were compared to those of a Coulter LH 750 and Coulter LH 500. Three pools of amniotic fluid, commercial quality control materials, and proficiency test specimens were analyzed on all four instruments. Fifty patient specimens were also analyzed using the Coulter LH 500 and the Unicel DxH 800. Results: The mean values and precision obtained from commercial quality control materials and proficiency test samples were comparable on all four instruments. However, many erroneously low LBC results were produced from amniotic fluid pools using both DxH 800 instruments. The erroneous values were approximately 50% lower than respective target values, occurred randomly, and affected the low, medium, and high LBC results. Inter-assay precision of the three pools ranged from 24.7 to 39.0 CV% on the DxH 800 instruments. Conclusions: The source of LBC errors likely involves the exclusion of smaller lamellar bodies from the counts. The DxH 800 combines new data fusion technology and mathematical algorithms to produce increased accuracy and flagging efficiency. Laboratorians should be aware that the improved specificity of the DxH 800 may preclude its use for this laboratory-developed test.     

The thromboplastic activity of lung surfactant in amniotic fluid and its application to prenatal assessment of fetal lung maturity

Based on the fact that both tissue thromboplastin and lung surfactant show lamellar structures under the electron microscope and belong chemically to lipoprotein, the thromboplastic activity of lung surfactant in amniotic fluid was studied by measuring plasma recalcification time. The results obtained were as follows (1) The surfactant fractions isolated from amniotic fluid and rabbit or pig lung showed the thromboplastic activity with dose response. (2) The thromboplastic activity of amniotic fluid increased with advancing gestational age. (3) It was found that the thromboplastic activity determined by plasma recalcification time was parallel with the surfactant concentration of amniotic fluid. (4) The shortening rate of plasma recalcification time in amniotic fluid could estimate well the risk of RDS, and the critical value for RDS was assumed to be about 33%.