How does a doctor differentiate between Type 2 and Type 1.5 LADA?

I'm just curious, and I'm having a hard time understanding exactly what the difference is between the two. And if so many cases of Type 1.5 are misdiagnosed as Type 2, how does the Dr. know for sure? I'm assuming one difference is Type 1.5 is an autoimmune disease and Type 2 isn't, but not sure what an autoimmune disease is and how its connected with diabetes. Perhaps someone can put it into laymen's terms where I can understand.

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Autoimmune disease is when the body immune system which was made to protect the body against bacteria and viruses by starting a cascade of reactions to halt their effect and protect the body,is disrupted and start attacking the self as forign.So antibodies will attack islet cell in Pancreas,or throid tissues or other organs.Why this happen,there are some theories but still not completely know why,though it is known how.
Type2 diabetes is a kind of exhausted Beta cells with much insulin produced over time but not doing its job,so increasind daily activity,or reducing some of abdominal fat,if present may improve insulin work,if not,medicine or insulin are added to normalise blood glucose.
So what kind of tests would my Dr. run to find out if what I have is Type 2 or possibly Type 1.5? How would he determine that?
Type 1.5 is type 1 autoimmune diabetes with onset during adulthood.
Gad antibodies,islet cell antibodies.... For autoimmune type1 diabetes,the problem is there is type1b,non autoimmune according to ADA classification of type1.Excluding autoimmune type is important so you do not have to screen for other autoimmune diseases periodically.Type2 insulin resistance.fasting c peptide& insulin are usually done.
There are very rare other types ( MODY).
The tests are a C-peptide test to see how much insulin is being produced & an antibody test. Are you responding to your oral meds? Some people produce sufficient insulin, but their bodies don't utlize it well. They're insulin resistant. Type 1's have very little insulin production, if any.
I had to leave the oral meds behind some time ago. I started out on Lantus, then Levimir, then Novolog, and Humulin. I was taking between 200 and 300 units a day. I have been on the pump now for about 6 weeks or so. This is the first time in a year that my blood sugar is down in the low 100's. I am currently averaging probably 110 units of Humalog a day on the pump. So, I don't know. I guess I will question my Dr. when I go back in.
Doesn't sound like you're Type 2 if you're taking that much insulin. Congrats on better numbers & less insulin on the pump. That's great!
Actually it's quite the opposite. Type 1 (and 1.5) generally don't have insulin resistance, or least not much, so we typically take less insulin than a type 2. Type 2s have trouble using the insulin so can need 10 times as much for the same job.
I can use just 2 or 3 units for the same meal a type 2 could take 40 units for.

Even a type 1 can have insulin resistance though - and we all get it when our blood sugars are high. So you can't be sure what's going on until the BG has been within normal range for a while.
Thanks for the advice. I have had this disease for 3 years now, and I still don't completely understand it. I have learned more since the Dr. put me on the pump and I discovered this website than I ever have before.
Bobby. Number 1. Stop thinking of it as a disease. Its not. Its just a medical condition :) one just has to cope up with it. I'm type 2. With my intake of insulin that was increasing with every given week.

I just discovered the easy part then. Start exercising, and learn my limits of EVERYTHING. That cut the intake down and got me back on pills. :)
Idfinitely agree. diabetes isn't an illness. It's a metabolic disorder. I am fitter now than when I was a 40 year old non-diabetic. Resting hear rate below 60
Diabetes is a Disease stop kidding yourself - It is a curse for life
That's a big dose of insulin per day
How many carbs are you eaing?
Has your doctor suggested combining Metformin wih insulin?

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