Hi Gemma,
I was also first diagnosed at T2, which made sense at the time: fat 50yo woman with a T2 father. Initially I did really well on first diet only for three years, lost loads of weight was congratulated as a perfect patient. Then needed to go onto Metformin, again did really well for 3+ years, lost more weight, finally became slim then I couldn't control things at all, kept losing weight but couldn't get BS below 15 despite ever stricter diet and more Metformin. I was re-diagnosed as LADA aged 57 - GAD was 2000+, possibly 2,100? but can't really remember. What I do remember was my Endo's excitement at showing me the result on her computer screen which told me this was not something she routinely came across. I don't think GAD results can be linear, but my quick Google search gave the results for Generalised Anxiety Disorder and I already worry about enough things! So I don't know how meaningful some of the numbers are once you move into the positive zone. What I learnt at that consultation is that LADA is often associated with other autoimmune conditions -in my case long-standing familial thyroid disease, so I had risk factors for both T1 and T2. This might be something for you to bear in mind?
I went onto long-acting (Humulin I) insulin straightaway, before the results of my GAD tests and appointment with Endo came through. This was a huge help and was on that plus low carb for about 18 months before I added Novorapid. Benefit of hindsight, from reading other people's histories on the LADA forum, I should have moved onto quick release insulin much sooner. However, the situation was complicated by Covid....Starting insulin is scary, but it's also a life-saver. Whatever your insulin route is, I am sure you will make it work for you.
Best of luck,
Susan x