Table 3. Stability Evaluation of SUV at Two Distinct Levels (LQC and HQC) (mean ± SD, n = 6).

stability	nominal conc. (ng/band)	conc. found (ng/band) ± SD	precision (% RSD)	accuracy (% recovery)
benchtop (12 h)	50	51.03 ± 2.23	4.36	102.06
	1600	1545.21 ± 61.32	3.96	96.57
refrigeration (overnight)	50	48.42 ± 2.03	4.19	96.84
	1600	1671.41 ± 64.32	3.84	104.46
freeze thaw (three cycles)	50	49.21 ± 2.14	4.34	98.42
	1600	1538.23 ± 59.41	3.86	96.13
freezer at −80 °C (30 days)	50	50.97 ± 2.38	4.66	101.94
	1600	1574.31 ± 66.35	4.21	98.39