CATEGORY: METABOLIC & BLOOD SUGAR
Could an ordinary pediatric checkup catch type 1 diabetes years before a child feels sick? Researchers in Bavaria, Germany spent a decade finding out, adding a blood test to routine visits for 220,476 young children. The test found an early, symptom-free stage of the disease in about 3 children per 1,000, and 36% of those children went on to develop full type 1 diabetes within five years.1 Having a relative with the disease made no difference to how fast it progressed.
A disease that announces itself years early
Type 1 diabetes is the form where the immune system destroys the pancreas cells that make insulin. It usually appears in childhood, and the attack starts quietly, long before any symptom. The blood test looks for islet autoantibodies. Those are immune proteins that mark the pancreas as under attack, and they show up years ahead of trouble. Two or more of them with normal blood sugar counts as stage 1. When sugar levels start drifting but the child still feels fine, that’s stage 2. Clinical diabetes, with symptoms and insulin needs, is stage 3.
What ten years of screening turned up
Pediatricians screened children at regular visits, mostly around age 3, from 2015 to 2025. Nobody was assigned anything; this was a running count of what testing found in everyday practices. At first screening, 590 children had early-stage disease, an adjusted 0.3% of everyone tested. Families were offered specialist follow-up, and the children were tracked for a median of 5.7 years. Progression ran at about 9.6% per year. Over the follow-up, 260 screened children developed clinical diabetes, and the screening program had flagged 212 of them in advance. That’s 81% of future cases identified before symptoms.
Why catching it early matters now
For most of a century, knowing early changed little. That has shifted. A child identified in advance can start insulin before the dangerous emergency called diabetic ketoacidosis develops, which is how the disease often announces itself when nobody is watching. And since 2022 there has been teplizumab, an approved drug that can delay the move from stage 2 to full diabetes. A positive screen is not a diagnosis. Most children in this study were still diabetes-free five years after one, and the finding says who deserves watching, not who is sick. The family-history result may be the most useful part: most type 1 diabetes appears in families with no history of it at all, and this study found those children progress just as fast once the antibodies appear.
Key Takeaways
- Screening 220,476 young children at routine checkups found early-stage type 1 diabetes in about 3 per 1,000.
- Of children with early-stage disease, 36% developed clinical diabetes within five years, a rate of roughly 9.6% per year.
- Screening flagged 81% of the children who later developed diabetes, and progression was the same with or without a family history.
- This was an observational screening program, not a randomized trial, and an early-stage finding is a risk marker rather than a diagnosis.
References
- Winkler C, Friedl N, Abt R, et al. Screening Children for Early-Stage Type 1 Diabetes. JAMA. 2026;335(23):2046–2056. link