Table 7.
Summaries of intra- and inter-assay precision for repeated testing of three quality control samples and one plasma pool
| Aβ1–42 (pg/ml) | ||||
|---|---|---|---|---|
| Sample | QC1 | QC2 | QC3 | Plasma poola |
| Intra-assay means (n = 4) | 20.5 | 4.89 | 0.696 | 5.32 |
| 20.0 | 4.87 | 0.628 | 5.00 | |
| 19.6 | 4.76 | 0.745 | 5.32 | |
| Intra-assay CV% | 2 | 2 | 1 | 1 |
| 4 | 1 | 7 | 1 | |
| 0.4 | 0.1 | 8 | 3 | |
| Inter-assay means (n = 3) | 20.0 | 4.84 | 0.689 | 5.20 |
| Inter-assay CV% | 2 | 2 | 8 | 4 |
Aβ amyloid-β, CV% Coefficient of variation percentage, QC Quality control
a n = 18 for plasma pool; the reported Aβ1–42 levels in plasma pool were corrected for four-fold sample dilution