Table 4. Spiking recovery.
| Sample | Observed | Expected | Recovery |
| ng/mL | ng/mL | O/E% | |
| 1 | 117 | ||
| 229 | 217 | 106 | |
| 385 | 317 | 121 | |
| 588 | 517 | 114 | |
| 2 | 107 | ||
| 322 | 294 | 110 | |
| 546 | 482 | 113 | |
| 757 | 857 | 88.3 |
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