Table 3.
Number of Levey-Jennings QC charts needed to be reviewed for the investigation.
| Criteria for QC review | QC level | Number of QC chart | Total |
|---|---|---|---|
| Bias > all-meter SD | Low | 5 | 543 |
| high | 11 | ||
| Imprecision > all-meter SD | Low | 267 | |
| high | 260 | ||
| Bias > all-meter SD + Sigma value < 4 | Low | 2 | 178 |
| high | 4 | ||
| Imprecision > all-meter SD + Sigma value < 4 | Low | 57 | |
| high | 115 | ||
| Bias > all-meter SD + Sigma value < 3.5 | Low | 0 | 61 |
| high | 4 | ||
| Imprecision > all-meter SD + Sigma value < 3.5 | Low | 20 | |
| high | 37 | ||
| Bias > all-meter SD + Sigma value < 3 | Low | 0 | 19 |
| high | 3 | ||
| Imprecision > all-meter SD + Sigma value < 3 | Low | 4 | |
| high | 12 |
QC; Quality control. SD; standard deviation.