Why "Type 1.5" Is an Imperfect Name

You will often see LADA called "Type 1.5 diabetes", or written as Type 1½. It is a nickname, not an official term.

The name gets one thing right. LADA genuinely sits between the two familiar types. The cause is autoimmune, like Type 1. The start is gradual and treatable with tablets at first, like Type 2. Body weight, waist size, blood pressure and blood fats also tend to fall between the two.

Where the name misleads is in suggesting a tidy midpoint. In practice LADA covers a wide range. Some people need insulin within a year. Others manage on tablets for several years. The main thing separating those two experiences is how strong the immune attack is, which the antibody level partly reflects.

It also implies LADA is an official third category. It is not. Diabetes UK describes it as not currently classified as a separate type, with research still working out exactly what distinguishes it.

None of this changes what you should do. Whether your report says LADA, Type 1.5, or slowly progressing Type 1, the useful facts are the same: your immune system is the cause, your insulin production will keep falling, and your treatment will need to change as it does.

So treat the label as shorthand. What actually guides your care is the three formal criteria and your test results.