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Table 4 Urine stability experiment (n = 3)

From: A new approach for urinary vanillylmandelic acid determination using eVol microextraction by packed sorbent coupled to liquid chromatography-tandem mass spectrometry

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