Hi again, Lisa,
You may find that Ben's blood glucose swings up high temporarily after his having had this low number today. It's called 'rebound' (or 'bouncing').
When a cat's blood glucose drops too low or too fast (or both) the body can respond to that by releasing glucose (from the liver) into the system to raise the blood glucose level. It can also release counter-regulatory hormones, the purpose of which is to try to keep the blood glucose high. It''s the body's way of trying to keep the kitty safe.
This may not happen, but I just thought you should know that it's a possibility. If it does happen there's no action to be taken. It's just a matter of waiting for the effect to clear. (That can take anything up to a few days.)
FYI, we recommend that, for kitties that are newly diagnosed (and where there is little blood testing data), no insulin is given if the preshot BG level (blood glucose test immediately prior to the shot) is below 200.
You're having quite a day today, Lisa: Learning to test and dealing with an unexpectedly low number!
Is there any chance you could get another test to double-check that the blood glucose is still coming up...?
Eliz