No sign of fleas. His blood glucose level dropped from 351 to 208, still outside normal range of 70 - 150 but we're going to stay the course with canned food. The level associated with possible kidney infection was about the same. And the calcium level (associated with lymphoma) is now within the normal range (maybe I was eating a lot of cereal a couple weeks ago).
And Otto was so good while the vet poked around trying to find a vein. He deserves big hugs.