i dont see how the sterility of the bottle would come into question.... it was sterile enough to shoot the test out of ... how would that magically change when the bottle is empty?
however, i would not attempt to "re-sterilize" it... i would just get as much of the test out as possible, then put the hcg or igf into it.... now the question becomes what interaction the left over test would have with the other compounds... but that is a seperate issue... i dont think the sterility of the bottle is a question.