Sigma Metric Analysis
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.
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.
Our first look at Abbott's newest, biggest chemistry instrument, using a method validation study that was shown at the 2007 AACC conference.
A look at 2007 poster data evaluating performance of the ADVIA 1800 chemistry system. From the 2007 AACC/ASCLS annual meeting.
Our first look at Abbott's newest, biggest chemistry instrument showed interesting Sigma performance. So we decided to take a second look, using 2007 AACC conference poster data. Does an on-site evaluation corroborate the manufacturer's evaluation?