Theoretical Calculated  
concentration concentration Recovery
PGE1 (µg/ml) (µg/ml) ± SD  
12 11.976 ± 0.081 99.8
13.5 13.495 ± 0.072 99.96
15 15.050 ± 0.092 100.33
16.5 16.531 ± 0.155 100.19
18 17.976 ± 0.086 99.86
S.D = Standard Deviation
Table 3: % of recoveries for PGE1.