Table 2.
Inter-day average back-calculated standard concentrations (n = 5)
| Theoretical | conc, ng/mL | 2.00 | 5.00 | 10.0 | 20.0 | 50.0 | 100 | 150 | 200 | a | b | c | R |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ARM | Mean, ng/mL | 1.94 | 5.05 | 10.3 | 20.0 | 49.0 | 100 | 150 | 199 | −8E-06 | 0.013 | −0.0014 | 0.9989 |
| SD | 0.14 | 0.17 | 0.46 | 0.71 | 2.0 | 4.2 | 9.2 | 4.0 | -- | 0.0008 | |||
| Precision (RSD,%) | 7.4 | 3.4 | 4.5 | 3.5 | 4.2 | 4.2 | 6.1 | 2.0 | -- | 0.08 | |||
| Accuracy (% dev) | −2.8 | 1.1 | 2.5 | 0.1 | −2.0 | 0.2 | 0.3 | −0.5 | -- | -- | |||
| DHA | Mean, ng/mL | 2.08 | 4.83 | 10.0 | 19.8 | 49.4 | 101 | 155 | 196 | −5E-05 | 0.087 | −0.0172 | 0.9994 |
| SD | 0.1 | 0.3 | 0.3 | 0.7 | 1.4 | 3.3 | 4.7 | 4.0 | 0.0006 | ||||
| Precision (RSD,%) | 6.4 | 5.3 | 2.5 | 3.5 | 2.9 | 3.3 | 3.1 | 2.1 | 0.1 | ||||
| Accuracy (% dev) | 3.8 | −3.4 | 0.1 | −1.1 | −1.2 | 0.5 | 3.3 | −1.8 |
Quadratic fitting equation: y = ax^2 + bx + c