# Type 1 diabetes diagnosis: antibody tests and C-peptide

**URL:** <https://forum.fudiabetes.org/t/type-1-diabetes-diagnosis-antibody-tests-and-c-peptide/1037>\
**Category:** wiki1\
**Tags:** wiki, type-1, diagnosis, type-2\
**Created:** [May 24, 2017, 8:12pm UTC](https://forum.fudiabetes.org/t/type-1-diabetes-diagnosis-antibody-tests-and-c-peptide/1037 "2017-05-24T20:12:23Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![TomH](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/tomh/32/9063_2.png) [@TomH](https://forum.fudiabetes.org/u/TomH)\
**Post date:** [May 24, 2024, 1:22pm UTC](https://forum.fudiabetes.org/t/type-1-diabetes-diagnosis-antibody-tests-and-c-peptide/1037/14 "2024-05-24T13:22:48Z")

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> [@3 months after surgery less insulin sensitive](https://forum.fudiabetes.org/t/3-months-after-surgery-less-insulin-sensitive/14674/2):
>
> I have always tested high for anti-insulin antibodies.
> 
> Normal value: 0.0 - 0.4 U/mL. **Value \>50.0 High**

I’m reviving this topic to ask a question about an IAA test. Thanks to @SobeiT’s for causing me to try and educate myself (see posted quote), causing me to try to use my mind’s limited fine-grain net…it failed! So, I went back to the lab report confirming my dx as T1 a couple years ago. In addition to having GAD, they a whole panel of tests, including IAA. Then ‘til now, I viewed the IAA test result through the prism of “did I have T1 or T2,” never thinking of what IAA stood for or other potential consequences. Realizing we aren’t pedigreed docs, am I correct in understanding a high IAA result “can” mean my insulin dosing may not work as effectively due to the anti-bodies attacking the very insulin I’m using to treat myself for carbs or high BGs? My understanding is a “normal” IAA result is \<=5 and my result was a 45 (yes, @SobeiT you beat me!). I’m wondering if this may be why I sometimes get stuck on a higher than desired BG with little insulin impact and why my other numbers seems little “abnormal” compared to others (I realize YDMV and comparison’s often don’t work). I plan to engage my current Endo about IAA and it’s application, but my next appt isn’t for 6 months. Thanks to anyone that can shed light in advance!

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