Figure 2. Mean extraction efficiencies for target adrenal and gonadal steroids in pilot whale blubber, determined by a spike-retrieval experiment with blubber samples from two individuals (RJM009 and RT48). Analytes were quantified using isotopically matched internal standards. DHEA, which did not have a matched internal standard, was quantified using S-13C3. Error bars represent standard deviation and red lines delineate the acceptable percent recovery range (70% - 120%). RSDs are shown in the shaded bar along the bottom.