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Stabilities of three of freeze-thaw cycles (n = 6).
| Concentration (ng/mL) | 1 | 2 | 3 | 4 | 5 | 6 | AVE | RE (%) |
|---|---|---|---|---|---|---|---|---|
| 11.14 | 10.9 | 10.6 | 11.0 | 10.6 | 10.9 | 12.1 | 11.0 | 1.0 |
| 557 | 560.4 | 547.0 | 547.2 | 524.5 | 553.6 | 563.7 | 549.4 | 1.4 |
| 1114 | 969.8 | 1091.1 | 984.6 | 1007.6 | 1018.7 | 996.3 | 1011.4 | 9.2 |
