Table I. Analytical performance levels (precision and accuracy) calculated for replicated calibration curves of ApoE4 peptide in ϵ4ϵ4 plasma diluted with ϵ3ϵ3 plasma.
| Sample type | n | ϵ4ϵ4 plasma volume ratio | Estimated concentration (μg/ml) | CV (%)a | Accuracyb |
|---|---|---|---|---|---|
| Standard | 9 | 0.00 | 0.0 | 4.8 | N/A |
| Standard | 9 | 0.14 | 6.66 | 7.2 | 99.2 |
| Standard | 9 | 0.29 | 13.3 | 9.5 | 97.3 |
| Standard | 9 | 0.43 | 20.0 | 9.5 | 99.6 |
| Standard | 9 | 0.57 | 26.6 | 5.0 | 101.2 |
| Standard | 9 | 0.71 | 33.3 | 5.8 | 102.0 |
| Standard | 9 | 1.00 | 46.6 | 5.0 | 98.9 |
| QC | 9 | 0.17 | 7.99 | 6.6 | 99.7 |
| QC | 9 | 0.51 | 24.0 | 6.8 | 98.6 |
| QC | 9 | 0.86 | 40.0 | 7.2 | 102.9 |
a Expressed as the relative standard deviation (S.D.), i.e., S.D./mean × 100.
b Expressed as a percent difference: ((concentration found − concentration added)/concentration added) × 100.