Like most things, this is a judgment call, but you have to focus on the importance of the procedure if unusual lab results do show up and then either compensate for the problems found or consider treating them after the surgery or dental work is over. My 9-year old cat, Buck, just got the blood test results from his recheck at the Veterinary dermatologist. He gets a monthly allergy shot and, when there's a pretty severe flair-up, occasional prednisone treatment. My question involves his level of blood glucose, which was reported at 208. The vet alerted me to the fact that it was a little elevated, but it may have been a result of stress from office visit.
Cats can elevate their glucose simply by being stressed.
Buck has always been highstrung so this would not have been unusual for him to do. Suggested a urinalysis if I was really nervous. Needless to say, I'm a little alarmed, not having any experience with what levels are normal and what levels are signaling a problem. His hair coat seems healthy, he's very energetic and has a good, constant appetite. I would say he urinates about 2-3 times in 24 hours, usually directly after meals or snacks.