40ml volume DBS (%) 30ml volume DBS (%) 20ml volume DBS (%)
Replicate 1 96.62     90.28 92.94
Replicate 2 72.62 83.77 94.09
Replicate 3 110.78 97.04 74.81
Replicate 4 108.48   78.03 99.31
Replicate 5 88.66 89.20 80.93
Replicate 6 94.33 97.76 68.98
Average               95.25     89.35 85.18
RSD %   14.66 8.52 14.16
Recovery of captopril from 8mm diameter dried blood spots by the extraction procedure
Table 3b: 100ng/ml captopril dried blood spots spotted at 20, 30 and 40μl.
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