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Stability of the QC samplesa
| QC concn | Accuracy (bias [%]) |
|
|---|---|---|
| After 1 mo in refrigerator (2–8°C) | Fresh QC samples after 1 freeze-thaw cycle (−20°C) | |
| Low | 3.4 | 1.7 |
| Medium | 6.8 | 8.0 |
| High | 9.7 | 8.1 |
Stability under both storage conditions was assessed 5-fold.
