Thanks to everyone for the info. Trixie actually had her first at-home treatment on Sunday. She's a really good patient (except for nail trims). Currently using a heating pad for warming, microwaves are out since the bag has a metal ring. I'll have to dig through the records for the values later.
O.K., looking over the most recent test:
BUN = 84mg/dL (down from 104)
CREA = 3.9mg/dL (down from 5.1)
These were taken after her 2 day stay with a continuous I.V. drip. Still on the high side, but luckily she still has her normal appetite and energy level. She is also on the Hill's k/d diet.