Table 1A.
Accuracy and precision of calibration standards.
| Nominal (ng/mL) | GM (ng/mL) | SD (ng/mL) | CV (%) | DEV (%) | n |
|---|---|---|---|---|---|
| 0.5 | 0.500 | 0.0577 | 11.5 | – | 7 |
| 1 | 0.988 | 0.0641 | 6.49 | −1.25 | 8 |
| 2 | 1.99 | 0.164 | 8.26 | −0.625 | 8 |
| 5 | 5.14 | 0.200 | 3.88 | 2.75 | 8 |
| 10 | 9.98 | 0.656 | 6.58 | −0.250 | 8 |
| 25 | 25.1 | 1.20 | 4.80 | 0.300 | 8 |
| 50 | 47.7 | 1.76 | 3.70 | −4.70 | 8 |
| 250 | 251 | 7.44 | 2.96 | 0.370 | 8 |
| 1000 | 1020 | 33.5 | 3.28 | 2.12 | 8 |
| 2000 | 2050 | 73.9 | 3.60 | 2.56 | 8 |
| 5000 | 4930 | 159 | 3.22 | −1.34 | 8 |
Abbreviations: GM, grand mean; SD, standard deviation; CV (%), coefficient of variation; DEV (%) relative deviation from nominal value; n, total number of samples. Each calibration standard was prepared fresh daily in duplicate on each of four days. A dash (-) indicates no observed DEV.