The two tests:
IAA Test
IGF-1 (Acro) Test
I don't know if anyone has mentioned to you already - Lantus is said to sting at higher doses, and many switch to Levemir because it is more gentle and avoids the sting. I have noticed that Shadoe prefers Lev and does better on Lev.
While the two insulins may be handled/considered almost the same, there are differences, including guaranteed for 42days for Lev and some cats needing less Lev than Lantus. When switching from Lantus to Lev, it is advised to give less Lev and work up to the ideal dose.
Lantus & Levemir: What’s the Difference?
You may want to look into the cost and the arrangements for having the two tests done. Take prints of the two above sheets to your vet and ask to get an estimate of the cost for draw and shipping; the actual test costs may be negligible, but all the other costs add up.
Getting the tests done will let you know if you are dealing with a healthy pancreas or not. Until you have the tests done, you may want to keep BG above 100 because it is not easy to bring up the BG with food like normal DM kitties - some kitties will get even lower numbers by feeding because of the functioning pancreas.
You will not treat any differently after the tests, but you will have a reason for the resistance. If IAA is positive, you can be more aggressive and aim for green numbers, but if acro is positive, you need to stick above 100. You will still use your two insulins as needed.
ETA: You may think about switching to vials instead of pens; the vials may be cheaper for you now.
Also, seeing to the dental is more important than the tests because dental problems can cause a higher dose. Shadoe's dose dropped from 14u down to 2.75u after her dental.
