摘要:
Objective To evaluate the performance of the body fluid (BF)mode on Sysmex XT-4000i for counting blood cells in cerebrospinal fluid (CSF). Methods One hundred and forty -two CSF specimens were collected from the inpatients in Shandong Provincial Hospital from June to December,2015. Blood cells of all the specimens were counted for method comparison between Sysmex XT-4000i and manual microscope (counting chamber and stained cytospin slides). Results Excellent correlations were found for counting white blood cells (y=1.17x+3.21,n=118,r2=0.98), mononuclear cells (y=0.81x+13.61,n=101,r2=0.88),polynuclear cells (y=0.82x+5.15,n=101,r2=0.88)and red blood cells (y = 1.01x+146.40,n = 62,r2= 0.99). Good agreement was found between levels of high fluorescent (HF)cells detected by XT-4000i and large cells (macrophages or malignant cells)found under the microscope (y =0.54x+3.31,n= 101,r2= 0.27,P 0.05).The true positive rate of eosnophils was 9.8% and their true negative rate was 80.0%.Good precision(CV≤30%) was got in white blood cells,mononuclear cells,polynuclear cells and red blood cells counted by XT-4000i. Both carry-over (≤0.3%)and linearity (r2=0.99)were also excellent for white blood cells and red blood cells. Conclusion The BF mode on XT-4000i may be routinely used for CSF cells count because of its excellent accuracy and precision. HF cells may have some predictive value in large cells in CSF.%目的 评估血细胞分析仪Sysmex XT-4000i体液(body fluid,BF)模式进行脑脊液细胞计数的性能. 方法收集2015年6~12月山东省立医院住院患者脑脊液标本142份,用XT-4000i进行细胞计数和分类,并与人工显微镜(人工灌板和细胞离心染色)计数进行方法学比较.结果 XT-4000i和人工显微镜计数之间白细胞计数(y=1.17x+3.21,n=118, r2=0.98)、单个核细胞计数(y=0.81x+13.61,n=101,r2=0.88)、多个核细胞计数(y=0.82x+5.15,n=101,r2=0.88)、红细胞计数(y=1.01x+146.40,n=62,r2=0.99)均呈高度相关.XT-4000i检测的研究参数高荧光强度细胞(HF-BF)水平与显微镜下查到大细胞(吞噬细胞或恶性细胞等)具有相关性(y=0.54x+3.31,n=101,r2=0.27,P0.05),真阳性率是9.8%,真阴性率是80.0%.XT-4000i的白细胞、单个核细胞、多个核细胞和红细胞计数均表现出良好的精密度(CV≤30%).白细胞计数和红细胞计数具有良好的携带污染率(carry-over≤0.3%)和线性分析(r2=0.99).结论 XT-4000i体液模式的准确度和精密度良好,可用于日常脑脊液细胞计数.高荧光强度细胞水平对脑脊液中的大细胞具有一定的提示预测作用.