Table 4. Freeze-thaw stability of BPA in human plasma.
| Stability | Quality Control | Average | SD | % CV | Accuracy (%) | Inaccuracy (%) |
|---|---|---|---|---|---|---|
| Cycle 1 | QCL (70 ng/mL) | 74.68 | 2.45 | 3.28 | 106.6 | 6.6 |
| QCM (800 ng/mL) | 755.8 | 21.84 | 2.89 | 94.48 | 5.52 | |
| QCH (1500 ng/mL) | 1426 | 105.26 | 7.38 | 95 | 5 | |
| Cycle 2 | QCL (70 ng/mL) | 77.96 | 5.56 | 7.13 | 111.32 | 11.32 |
| QCM (800 ng/mL) | 804 | 35.55 | 4.42 | 100.46 | 0.46 | |
| QCH (1500 ng/mL) | 1582 | 105.69 | 6.68 | 105.42 | 5.42 |
QCL: quality control low; QCM: quality control medium; QCH: quality control high; SD: standard deviation; CV: coefficient of variation