http://www.smartgroups.com/message/readmessage.cfm?gid=1423922&messageid=3858 I also have a bilateral who is doing well at home. I have maintained her well on injectable Percorten every 18-28 days. Earlier, she lasted longer between shots - up to 28 days - but we are now giving it every 18 days. You can certainly do bloodwork, and we did in the early stages, but now I can just tell when she needs her shot - she is lethargic, unresponsive, doesn't want to eat - very out of character. 12 hours after her shot - she's bouncing around the house again. Bilateral ferrets now have an excellent shot at a substantial life after surgery. If they make it through the first 48 hours afterward, the prognosis is very good. With kindest regards, Bruce Williams, DVM [Posted in FML issue 4104]