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Linearity of quantitative measurement procedure represented as percentage recovery (Expected/Observed HER2 ECD level) for different proportions SL (Serum Low) and SH (Serum High).
| Sample | SL:SH ratio | Expected HER2 ECD level (ng mL−1) | Observed HER2 ECD level (ng mL−1) | % Recovery |
|---|---|---|---|---|
| 1 | 1:0 | 6.1 | 6.06 | 99.5 |
| 2 | 3:1 | 6.8 | 6.2 | 91.3 |
| 3 | 1:1 | 7.3 | 6.7 | 91.6 |
| 4 | 1:3 | 8 | 7.9 | 98.3 |
| 5 | 0:1 | 8.7 | 8.6 | 99.9 |
