Tiny nodules (≤5 mm) with obscure borders tended to yield false-positive FNA results. Large nodules (>20 mm) with several US features tended to yield false-negative FNA results.
Objective. To compare the cytology quality of ultrasound-guided fine-needle biopsy in thyroid nodules with 22-, 23-, and 25-gauge (G) needles prospectively. Methods. A total of 240 consecutive nodules underwent ultrasound-guided fine-needle aspiration (USG-FNA) and 240 nodules underwent ultrasound-guided fine-needle capillary (USG-FNC) were included in this prospective study from October 2014 to February 2016. Each nodule was sampled using 22 G, 23 G, and 25 G needle according to designed orders, and 1240 smears were finally obtained. Cytology quality was scored by a cytologist blinded to needle selection. Results. In USG-FNA, the average scores and standard deviations were 5.50 ± 2.87 for 25 G needles, 4.82 ± 2.95 for 23 G needles, and 5.19 ± 2.81 for 22 G needles. In USG-FNC, the average scores and standard deviations of each group were 5.12 ± 2.69 for 25 G, 4.60 ± 2.90 for 23 G, and 4.90 ± 2.90 for 22 G needles. The specimen quality scores of 25 G group were significantly higher than that of 23 G group ( P < 0.017 ) in both USG-FNA and USG-FNC. However, the differences were not statistically significant in nondiagnostic rate using different gauge of needles ( P > 0.017 for all). Conclusions. 25 G needles obtained the highest scores of sample quality in thyroid FNA and FNC comparing with 22 G and 23 G needles. 25 G needle should be first choice of thyroid FNA and FNC in routine work.
Objective: To evaluate the performance of new optical platelet measurement channel on the BC-6800 Plus automated blood cell analyzer. Methods:The basic PLT count performance of the BC-6800 Plus was evaluated according to the requirements of the Clinical Laboratory and Standards Institute (CLSI) Document H26-A2. In addition, low-PLT-value specimens, red blood cell debris specimens, small red blood cell specimens, and giant PLT specimens were detected with the blood cell analyzer and a flow cytometer. Whole-blood specimens in ethylenediaminetetraacetic acid (EDTA) or sodium citrate anticoagulant tubes from 20 patients with EDTA-dependent PLT aggregation were determined in CDR mode of the analyzer.Results: Blank counting and the carryover contamination rate of PLTs using the BC-6800 Plus both met the technical requirements. For abnormal PLT specimens, PLT-O 8× and PLT-I both exhibited high comparability with flow cytometry. The comparability of PLT-O 8× with flow cytometry was better than that of PLT-I. In EDTA-anticoagulated blood specimens from 20 patients with EDTA-dependent PLT aggregation, the results of PLT-O were significantly higher than those for PLT-I using samples from the same tubes (P < .001). However, the PLT counts were similar between these two methods for sodium citrate-anticoagulated blood specimens (P = .263). Conclusion: The performance of PLT-O 8× in the BC-6800 Plus met the technical requirements. PLT-O 8× exhibited better reproducibility than did PLT-I for low-PLTvalue samples. Reexamination of abnormal PLT specimens using PLT-O 8× yielded more accurate results. PLT-O performed significantly better than PLT-I in the detection of EDTA-dependent PLT-aggregation specimens. K E Y W O R D S abnormal platelet, enhanced optical platelet, low-PLT-value, platelet aggregation From microscopic counting to instrumental methods and the flow cytometry method recommended by the International Council for Standardization in Hematology (ICSH), 1,2 each technological innovation has continuously improved the accuracy of platelet counting and reduced methodological interference. Platelet count by microscopy is the most intuitive method and produces the best resultswhen observing abnormal platelets. However, this method requires substantial knowledge of cell morphology on the part of laboratory staff and is highly subjective. The results vary greatly among laboratory workers, and it is time consuming and labor intensive.Therefore, microscopic examination is mainly used for the review of abnormal platelet counts 3,4 As a reference method, flow cytometry has the advantages of speed and accuracy, but the operation of this method is complex, places high demand on personnel, and is relatively expensive, making it difficult to promote in clinical laboratories 5 The BC-6800 Plus automated blood cell analyzer uses specific nucleic acid fluorescence dyes for platelet staining (PLT-O channel) to obtain optical platelet count results. Moreover, it improves the instrument algorithm system by automatically increasing counts ...
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