I find that insulin needs cycle, and especially at the higher doses (3-4 units 2x/day) testing is especially critical. Within a week Moby went from needing 4 units to 0 units (this can happen once in awhile; no one quite understands why.) I think that may be what happened to your precious baby. I'm glad he's doing well.

My vet actually prefers people to use the urine test strips. He thinks blood testing is stressful. But if you're used to doing that (and the cat is) it's probably more accurate.