Table 4 Urine stability experiment (n = 3)
Concentration (μg/mL) | Room temperature (42 h) | 3 freeze-thaw cycle (− 80 °C) | Long-term storage (− 80 °C, 56 days) | |||
|---|---|---|---|---|---|---|
Deviation (%) | CV (%) | Deviation (%) | CV (%) | Deviation (%) | CV (%) | |
3.50 | − 6.6 | 3.2 | − 2.3 | 5.0 | 2.3 | 3.0 |
10.0 | 2.3 | 2.9 | 13.3 | 2.4 | 0.3 | 2.8 |
80.0 | 1.1 | 2.2 | 10.0 | 2.8 | − 4.3 | 4.5 |