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Type 1 Diabetes

Staging Type 1: The Three Stages, Explained Simply

· 3 min read · Reviewed by GlucIQ Clinical Review Workflow
#staging#screening#cluster:prevention

For most of diabetes history, type 1 had two states: you didn’t have it, or you did — and the “you did” arrived as an emergency: thirst, weight loss, sometimes DKA.

That’s changed. Researchers now know type 1 develops in stages over years — and the stages can be detected before any symptoms. This isn’t academic. It’s the foundation of screening and the new prevention treatments.

The three stages

Stage 1: The immune system is attacking — but glucose is normal. A person has two or more diabetes autoantibodies (blood markers showing the immune attack has started). Their blood sugar is still completely normal. They feel fine. This can last months or years.

Stage 2: The attack is winning — glucose is starting to change. Still no symptoms, but blood tests show early glucose problems (like a rising blood sugar after a sugar drink). The insulin-making cells are visibly declining.

Stage 3: Symptoms appear — clinical type 1. The classic picture: thirst, frequent peeing, weight loss. This is when type 1 has historically been diagnosed — the “you have it” moment (Insel et al., 2015).

Why the stages matter

Two reasons — and they’re both recent:

1. Screening can catch people in Stage 1 or 2. Relatives of people with type 1 can be tested for autoantibodies. Finding the disease before symptoms means options.

2. Treatment now exists for Stage 2. Teplizumab — the drug that delays type 1 — is for people in Stage 2. For the first time, there’s something to do at that stage instead of waiting for the emergency.

Who should care about this

  • Parents with a child who has type 1 — siblings can be screened.
  • People with a family history of type 1.
  • Anyone with a close relative who got type 1 recently.

The scientific statement behind staging recommends considering screening for these groups (Insel et al., 2015).

The honest caveats

  • Most people with autoantibodies won’t be diagnosed tomorrow. The stages can take years.
  • Screening isn’t routine everywhere. Ask your care team about what’s available.
  • Knowing can be stressful. Some families find the information empowering; some find it anxiety-inducing. It’s a personal choice — and a conversation with your team.

The one-minute takeaway

Type 1 develops in three stages, detectable years before symptoms (Insel et al., 2015). That’s why screening exists — and why the new delay-treatment works. If someone close to you has type 1, the staging question is worth asking your care team: “Should we screen?”

References

  • Insel RA, et al. Staging presymptomatic type 1 diabetes: a scientific statement of JDRF, the Endocrine Society, and the American Diabetes Association. Diabetes Care. 2015. DOI: 10.2337/dc15-1419