Table 2.
Intraday and interday accuracy and precision of quality control samples of 5-ISMN.
| Nominal con. (ng/ml) | Intraday (n = 6) | Interday (n = 18) | ||||
|---|---|---|---|---|---|---|
| Measured con. (mean ± SD, ng/mL) | Precision (RSD %) | Accuracy (%) | Measured con. (mean ± SD, ng/mL) | Precision (RSD %) | Accuracy (%)a | |
| 5 | 4.64 ± 0.23 | 4.8 | -7.2 | 4.56 ± 0.30 | 6.6 | −8.8 |
| 8 | 8.22 ± 0.44 | 5.3 | 2.8 | 8.13 ± 0.44 | 5.4 | 1.6 |
| 80 | 85.7 ± 4.01 | 4.7 | 7.1 | 82.2 ± 3.31 | 4.0 | 2.8 |
| 800 | 824 ± 31.2 | 3.8 | 3.0 | 817 ± 19.2 | 2.4 | 2.1 |
Concentration is in 3 significant figures; SD, standard deviation; RSD%, percent relative standard deviation (in one decimal place). aExpressed as ((mean measured concentration−nominal concentration)/(nominal concentration)) × 100 (in one decimal place).