Table 4.
Reproducibility (inter‐assay variability) of 10 samples analyzed on four different analyzers (two samples were analyzed on all four analyzers, and eight samples were analyzed on one analyzer). None of the %CVs were less than 10%, which is a general target value for reproducibility. Only three of the 14 variabilities were within the "poor but acceptable" range of 10%‐20%. The samples that are shown in red are also depicted in Figure 1
| Sample# | Spec cPL | Analyzer | Measurements | %CV |
|---|---|---|---|---|
| µg/L | ||||
| 1 | 227 | 1 | 8 | 48.3 |
| 2 | 8 | 35.1 | ||
| 3 | 8 | 37.1 | ||
| 4 | 8 | 37.8 | ||
| 2 | 388 | 1 | 8 | 20.4 |
| 2 | 8 | 22.1 | ||
| 3 | 8 | 19.4 | ||
| 4 | 8 | 51.2 | ||
| 3 | 196 | 1 | 8 | N/A |
| 4 | 254 | 2 | 8 | N/A |
| 5 | 322 | 1 | 8 | 27.0 |
| 6 | 360 | 3 | 8 | 18.9 |
| 7 | 400 | 4 | 8 | 28.0 |
| 8 | 477 | 1 | 8 | 14.1 |
| 9 | 566 | 2 | 8 | 45.2 |
| 10 | 594 | 2 | 8 | 40.8 |
| Mean | 31.8 | |||
| SD | 12.0 |
Abbreviations: SD, standard deviation; %CV, percent coefficient of variation.