Application of a portable microscopic cell counter for the counting of residual leukocytes in leukoreduced apheresis platelet concentrates in a hospital blood bank

While a portable microscopic cell counter has been evaluated to enumerate residual white blood cells (WBCs) in red blood cells and platelet concentrates at blood centers, it has not yet been assessed in a hospital blood bank. We investigated the performance of this device and evaluated its accuracy, along with its benefits in time management.Residual WBCs from each of 100 apheresis platelet specimens were measured manually using a Nageotte chamber, along with flow cytometry methods and an ADAM-rWBC automated instrument (NanoEnTek, Seoul, South Korea). The efficiency was calculated by measuring the time required for the analysis of one specimen ten times consecutively.Flow cytometry and the ADAM-rWBC were able to detect four sporadic cases that had residual WBCs exceeding 1/μL that were not detected by the manual method. Analysis time was the shortest with the ADAM-rWBC, followed by flow cytometry and the manual method.Our data suggest that hospital blood banks require quality control of residual WBCs; among the methods evaluated in this study, the portable microscopic cell counter offers the best time efficiency.     

Process control of filtered red blood cells: which counting method?

Various counting methods have been described and reported for process control of leucodepleted blood components. The recent production of high-efficiency leucocyte removal filters intensifies the need for sensitivity in determining the ever lower residual concentration of white cells (WBCs) in filtered units.
In order to assess which method was the most efficient and feasible in the laboratory for the control of WBC-reduced packed red blood cells, we compared the sensitivity of four counting methods: Nageotte chamber analysis, flow cytometry, the fluorochrome method by Borzini and Nageotte chamber analysis as modified by Prati.
We observed a difference in the post-filtration WBC content depending on which method of counting was used and we feel it reasonable to ask what method should be employed in blood component process control.
The answer must naturally consider that the method is for use by a large number of laboratories, while the sensitivity of the method needs to be appropriate to the goal desired.     

Comparison between Nageotte and flow cytometric counting of residual leucocytes in freshly prepared leucocyte-reduced red blood cell components

Background

Flow cytometry (FC) and Nageotte hemocytometry represent the most widely accepted methods for counting residual white blood cells (rWBCs) in leucocyte-reduced (LR) blood components. Our aim was to study the agreement between the two methods, under real working blood bank conditions.

血小板单采样品中残留白细胞计数两种方法的评价

为评价流式细胞计数法和Nageotte血细胞计数法计数单采血小板中残留白细胞,应用系列的稀释实验研究其准确性;对已知白细胞浓度的同一样本,反复检测14次,研究其重复性;分别用流式细胞计数法和Nageotte血细胞计数法检测102份去白细胞的单采血小板样本,对其结果进行比较.结果发现,当白细胞浓度为0.8＜WBC/μl＜10时,两方法无显著差异（P＞0.05）.结论：两种方法均可用于少白细胞成分的质量控制.     

3种方法测定血液中微量白细胞计数效果的比较研究

目的　比较牛鲍式计数板、血球计数分析仪和Nageotte血细胞计数板 3种白细胞计数法测定血液中微量白细胞的效果。方法　将 1份血液标本重复用 3种方法计数 ,得出标准计数值 ,并将此标本稀释至不同浓度 ,以 3种计数法分别测定这些样品中白细胞的含量 ,比较测试值与期望值。同时 ,用这 3种方法检测了 3 0份过滤白细胞的血样中的微量白细胞。结果　牛鲍式计数板、血球计数分析仪在白细胞 <2 0 0× 1 0 6/L时 ,牛鲍式计数板测试值为“0” ,血球计数分析仪测试值为 2 0 0× 1 0 6/L ,无法准确反映低含量样品中白细胞的真实结果 ,Nageotte血细胞计数法则可准确测定血液中 >1 2× 1 0 6/L的白细胞。结论　测定血液中微量白细胞宜采用Nageotte血细胞计数板方法     

流式细胞术在成分血残留白细胞检测中的应用

目的 探讨流式细胞术(FCM)绝对计数法在成分血残留白细胞检测中的应用价值。方法 采用FCM绝对计数法检测不同稀释度的浓缩血小板样本中自细胞残留量，并与Nageotte血细胞计数板法比较。结果 两种方法计数微量白细胞具有高度相关性(r=0．9964，P＜0．001)。低浓度白细胞计数时，FCM法变异系数小于Nageotte计数板法。两种方法检测结果相比，Nageotte计数板法计数值偏低。结论 流式细胞术绝对计数法具有快速、客观、精确和重复性好等优点，是一种稳定的检测成分血中微量残存白细胞数的方法。