Objective To evaluate the value of Sysmex XT-4000i hematology analyzer in its body-fluid mode in cell count and cell differential count of pleural effusion, ascites and cerebrospinal fluid samples. Methods A total of 95 pleural effusion, ascites and cerebrospinal fluid samples were collected from patients hospitalized between May and September 2015. The samples were tested by Sysmex XT-4000i hematology analyzer (instrument method) and modified Neubauer hemocytometer (manual method) for cell count, and the results of them were compared and analyzed. Results The instrument method and the manual method had a good consistency in nuclear cell count and erythrocyte count (kappa=0.965,P< 0.001; kappa=0.988,P<0.001). There was no significant difference in the count of mononuclear cells (P> 0.05). However, there was a significant difference in the count of multiple nuclear cells (P<0.05). Conclusions Hematology analyzer in its body-fluid mode may replace manual method in cell count of pleural effusion, ascites and cerebrospinal fluids for its high precision, high efficiency and easy operation. However, cell differential count of this method needs microscopic examination assistance.
ObjectiveTo explore the dyeing conditions of reticular fiber staining of liver puncture tissue stained by BenchMark automatic special staining instrument, evaluate the staining effect, and share the using experience.MethodsA total of 30 cases of liver puncture specimens from April to May 2019 in West China Hospital of Sichuan University were selected. They were fixed with 4% neutral formaldehyde fix solution, treated with automatic dehydrator, embedded in paraffin, stained with adhesive slides, and baked in 65℃ oven for 30 min. Each specimen was sliced in duplicate, with a thickness of 5 μm. One was reticular fiber stained with BenchMark automatic special staining instrument under the dyeing condition according to the using experience of the laboratory, and the other was reticular fiber stained by manual Foot staining method according to the standard operating procedure of the laboratory. The staining effect under microscope was observed by a chief pathologist with extensive slide-reading experience.ResultsThe success rate of instrumental method was 100.0% (30/30), and that of the manual method was 76.7% (23/30). The difference in success rate between the two methods was statistically significant (χ2=5.143, P=0.023).ConclusionThe reticular fiber staining effect of BenchMark automatic special staining instrument is stable and reliable, and the success rate is higher than that of manual Foot staining.
Quality control refers to the general term of operation technology which activities to meet the quality requirements. Quality control is not only the need of the development of the laboratory itself, but also the important requirement of the laboratory accreditation organization for the development of the laboratory. To carry out quality control, first of all, a complete quality control system should be established. According to the pathological experiment process, which can be divided into pre-analysis, in-analysis and post-analysis quality control. There are some similarities between special staining and hematoxylin-eosin staining, but the details are slightly different. There are many kinds of special dyeing items, and each dyeing step is complicated, so it is difficult to control the quality according to the quality control technology of conventional pathological staining. This article reviews the whole process quality control of special dyeing by summarizing the literature and work experience, so as to contribute to the subsequent improvement of the quality of special dyeing.