Table 2. Accuracy and Precision within and between Runs of PVLs and Creatinine in Urine by LDTD-MS/MS.
| within
run (N = 6) |
between
run (N = 36) |
|||||||
|---|---|---|---|---|---|---|---|---|
| analyte | QC | nominal concentration (μg/L) | mean concentration (μg/L) | precision (% CV) | accuracy (%) | mean concentration (μg/L) | precision (% CV) | accuracy (%) |
| 3-HPVL (191 → 106) | CS #1 | 50 | 56.1 | 7.5 | 112.1 | |||
| QC-L | 150 | 148.3 | 1.6 | 98.9 | 153.2 | 6.3 | 102.1 | |
| QC-M | 1250 | 1232.8 | 4.9 | 98.6 | 1273.8 | 5.1 | 101.9 | |
| QC-H | 2250 | 2358.4 | 4.7 | 104.8 | 2330.8 | 5.0 | 103.6 | |
| CS #8 | 3000 | 2857.0 | 7.4 | 95.2 | ||||
| 3,4-DHPVL (207 → 163) | CS #1 | 255 | 287.7 | 5.8 | 112.8 | |||
| QC-L | 455 | 432.8 | 4.5 | 95.1 | 463.1 | 9.0 | 101.8 | |
| QC-M | 2655 | 2529.6 | 3.8 | 95.3 | 2561.4 | 10.6 | 96.5 | |
| QC-H | 4655 | 4720.1 | 4.4 | 101.4 | 4686.6 | 8.3 | 100.7 | |
| CS #8 | 6155 | 5559.6 | 6.8 | 90.3 | ||||
| creatinine (114 → 86) | CS #1 | 100 | 101.9 | 11.6 | 101.9 | |||
| QC-L | 300 | 299.1 | 3.1 | 99.7 | 293.7 | 5.6 | 97.9 | |
| QC-M | 1200 | 1154.7 | 3.8 | 96.2 | 1156.0 | 5.0 | 96.3 | |
| QC-H | 3000 | 2960.0 | 2.8 | 98.7 | 2967.0 | 4.0 | 98.9 | |
| CS #8 | 4000 | 4054.4 | 6.7 | 101.4 | ||||