Table 1.
Linearity, limit of quantification, and limit of detection of vitamin D metabolites measured by (a) Waters Quattro PremierTM/XE and (b) Agilent 6495B.
| Linearity | r | LOQ | LOD | |
|---|---|---|---|---|
| a. Waters Quattro PremierTM/XE | nmol/L | nmol/L | nmol/L | |
| 25(OH)D2 | 7.6–242.3 | 0.9969 | 7.6 | 2.3 |
| 25(OH)D3 | 7.8–249.6 | 0.9985 | 7.8 | 2.34 |
| 3-Epi25(OH)D3 | 7.8–249.6 | 0.9986 | 7.8 | 2.3 |
| b. Agilent 6495B | ||||
| 25(OH)D2 | 7.0–335 | 0.9999 | 7.0 | 2.1 |
| 25(OH)D3 | 4.3–270 | 0.9998 | 4.3 | 1.3 |
| 3-Epi25(OH)D3 | 1.7–137 | 0.9999 | 1.7 | 0.5 |
Limit of quantification (LOQ), limit of detection (LOD).