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| Added BNP concentration pmol/L | Measured concentration pmol/L | CV | Bias | ||
| Mean | S.D. | % | % | ||
| Intra-assay (n = 5) | 2.0 | 2.3 | 0.2 | 7.0 | 15.0 |
| 25 | 25 | 2.1 | 8.4 | 1.0 | |
| 100 | 99 | 7.1 | 7.2 | −0.7 | |
| Inter-assay (n = 15) | 2.0 | 2.1 | 0.2 | 9.5 | 5.0 |
| 25 | 24 | 1.7 | 2.9 | −4.0 | |
| 100 | 100 | 1.9 | 1.9 | 0.0 | |
