Captopril concentration in whole blood (ng/ml)
DBS volume (ml)
Mean concentration found ±SD (ng/ml) (n=6)
Precision (% RSD)
Accuracy (%bias)
400
40
405 ± 59
14.7
1.3
30
424 ± 18
4.3
6.0
20
399 ± 23
5.9
-0.3
100
102 ± 9
9.2
2.0
98 ± 8
8.5
-2.0
94 ± 13
14.1
-6.0
50
48 ± 4
9.3
-4.0
49 ± 5
10.2
48 ± 6
11.5