Table 4.

Stability of DBS after 30 days of storage.

Compound	Nominal conc. (ng/mL)	Precision (RSD %)	Accuracy (Error %)
Amlodipine	15	10.26	90.57
	150	3.35	89.84
	1500	1.92	88.29
Atenolol	25	6.61	88.42
	250	3.11	97.69
	2500	1.92	88.29
Atorvastatin	1	12.49	92.55
	10	5.33	89.98
	100	4.88	102.16
Digoxin	10	16.41	91.28
	100	2.44	95.73
	1000	5.27	97.63
Enalapril	0.5	14.43	93.24
	5	1.02	102.53
	50	4.94	97.07
Fenofibrate	15	3.47	97.54
	150	6.09	104.70
	1500	3.65	98.65
Furosemide	100	2.33	97.25
	1000	2.12	106.16
	10000	3.32	95.46
Losartan	10	5.76	88.07
	100	3.48	99.34
	1000	6.88	91.38
Nifedipine	25	5.00	97.34
	250	5.57	98.34
	2500	2.53	102.62
Propranolol	1	6.48	101.43
	10	2.35	101.52
	100	5.97	92.96
Simvastatin	25	5.83	94.49
	250	10.32	92.82
	2500	5.83	94.49
Valsartan	50	10.51	92.23
	500	4.31	99.71
	5000	4.59	101.43