40ml volume DBS (%) 30ml volume DBS (%) 20ml volume DBS (%)
Replicate 1 98.88 92.47     83.98
Replicate 2 106.81   97.23     88.08
Replicate 3 75.99 101.97   95.50
Replicate 4 95.62     93.55     87.67
Replicate 5 106.17   100.37 92.16
Replicate 6 74.33 92.65 97.76
Average               92.97 96.37     90.69
RSD %   14.45 4.12 5.35
Recovery of captopril from 8mm diameter dried blood spots by the extraction procedure
Table 3a: 400ng/ml captopril dried blood spots spotted at 20, 30 and 40μl.
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