Table 6. Inter-assay precision achieved from four calibration curves.
| Vitamin B12 added concentration(mg/ml) | Vitamin B12 mean measured concentration(mg/ml) | S.D.(mg/ml) | C.V.(%) | Accuracy(%) |
| 0.33 | 0.332 | 0.51 | 0.82 | 100.6 |
| 0.0825 | 0.0816 | 0.88 | 1.56 | 98.9 |
| 0.0412 | 0.0416 | 0.48 | 1.48 | 100.9 |
| 0.0206 | 0.0208 | 0.62 | 0.32 | 100.9 |