Sigma Metric Analysis
We analyze some data from the field and look at performance in the Roche Modular instrument.
An analysis of the Sysmex SE-9500
A frequent visitor to Westgard Web, Mary McDermott MT(ASCP), shared with us her performance data on the Beckman Coulter HMX hematology instrument. Data was collected for three controls, one lot each. No bias data was available, so the resulting metrics are provisional and incomplete. However, it is possible to calculate the allowable bias for specific levels of Sigma performance.
This is a rare opportunity: to analyze multiple performance studies on a single instrument. By looking back through two scientific journals, we were able to find studies around the world that describe the performance of the Sysmex XT 2000i.
Recently a workshop participant provided evaluation data for the Sysmex XE 2100 . This was evaluation data for three controls, precision data on 2 runs daily for 20 days. The data gives a good estimate for total imprecision, a figure which would be larger than any generated by a within-run precision study.