Re: 9/3 ** Harley PMPS 534 - response from vet
Your vet isn't wrong that IAA is rare, it is, but it happens. It's also true that it knowing he is IAA wouldn't change the treatment much. I guess I'm just the type of person who wants to know WHY, if possible.
The good news is that IGF-1 is the test we were talking about for acro and it is negative, so YAY! Harley is probably not acro. I think the number can vary if you test again, but probably not by that much.
I think the main difference for me between knowing and not knowing if he has IAA, is that with IAA we would possibly handle his dose reductions differently when he earns them. With a normal diabetic cat, we take reductions 0.25 at a time and work our way down the scale (sometimes fast, sometimes slow). Most of the time if a normal diabetic cat takes reductions too quickly, they might lose momentum and have to go back up. With IAA, once the resistance is broken, the cat can run down the dosing scale REALLY fast. They might be able to (or even NEED) to take much larger reductions. For example, he's getting 7 units now, if all of a sudden the resistance breaks then 7 might be way too much and instead of going down to 6.75, we might need to go down to 5. There have been a couple of higher dose cats here who raced down the dosing scale, and I really, really wished we knew if they were IAA because it would have helped know how to handle the reductions. A couple of times it even felt dangerous to not know (a cat that is only 0.25 over dose can handle low numbers, but when we don't know how far over dose they are, then a 35 could become dangerous very quickly).
There is also a bit of a difference on the way UP the dosing scale, but not as much. We would probably be a little more aggressive with an IAA cat than with a normal diabetic because we know that if he gets good numbers on a dose, then all of a sudden he doesn't anymore, he might be building a resistance at that dose and we need to hurry up and increase to help "squish" the antibodies.
Anyway, I think it would probably help to know if Harley has IAA, but I also think it's not the end of the world if we don't. I'm curious, though...