| Analyte | Intra-precision | Inter-precision | ||
| Retinol | µg/mL | CV (%) | µg/mL | CV (%) |
| 2.0 | 3.0 | 2.0 | 9.7 | |
| 4.0 | 2.3 | 4.0 | 14.2 | |
| 5.0 | 7.8 | 5.0 | 12.2 | |