| Nominal concentration (ng/mL) |
Observed concentration
(ng/mL, mean ± S.D.) |
Precision a
(%) |
Accuracy b
(%) |
| 10 |
10.17 ± 0.21 |
2.05 |
101.67 |
| 20 |
19.27 ± 1.15 |
5.97 |
96.33 |
| 50 |
44.35 ± 1.06 |
2.39 |
88.70 |
| 100 |
107.67 ± 4.04 |
3.75 |
107.67 |
| 200 |
216.67 ± 1.53 |
0.71 |
108.33 |
| 500 |
489.33 ± 20.13 |
4.11 |
97.87 |
| 1000 |
925.33 ± 22.19 |
2.40 |
92.53 |
| 2000 |
1940 ± 70 |
3.61 |
97 |
a Expressed as % R.S.D. (S.D./mean) × 100.
b Calculated as (mean determined concentration/nominal concentration) × 100. |
