Hmm, here's one more thing I just thought of. His IGF was normal (47, normal range is 12-92), but I think I remember seeing that you're not supposed to do that test until 90+ days after starting insulin. His test was about 2 months after starting insulin (started insulin 7/27, tested 9/25). Maybe we should get that test rerun just in case?
DEFINITELY get the test Re run!!
The way the HST experts interpret these results have changed. While over 92 increases specificity, elevated levels (especially if the test is done early before the cat has been treated with insulin for 6-8 weeks), are a red flag. The levels in Europe are different, cut off is 1000, but Niessen recommends investigating it if the level is over 600.
I am currently helping with a rescue & we had the ability to run the test early. My endo let me know if that early test was elevated, that would be helpful info. It came back well over the 92, but even IF it had been under, but elevated early, that would be a red flag that HST may be the issue.
This particular cats test came back at 145 & the MSU endo read on the report was “questionable” yet, because we were blessed to have an endo who has done work with Niessen & knew to skip over the repeat based on the 145, we moved forward with the CT. CT confirmed HST.
Teeth are also a great idea to have checked but in addition to the repeat testing

. I know sometimes there are issues seen only by X-ray though vs being able to see anything when looking. If you get a cleaning they will be able to get the X-ray. I’m not sure what your timing is but I believe February is Pet Dental Month and many practices give discounts.