Health experts are warning that common screening methods may miss early diabetes in some groups, putting patients at risk for delayed diagnosis and treatment. Clinicians and public health officials are weighing how to update screening so it works for more people, from city clinics in the United States to rural programs worldwide.
Diabetes is rising across regions, ages, and incomes. The International Diabetes Federation estimates that more than 500 million adults live with the disease worldwide. Many more have prediabetes and do not know it. Early detection is key because lifestyle changes and medicines can slow or prevent complications.
“Blood glucose levels can be a reliable indicator of diabetes risk. But in some populations, it’s not enough to catch the disease early.”
Why Single Measures Fall Short
Many clinics rely on one test at a time. Fasting plasma glucose or a random finger-stick reading is quick and cheap. But blood sugar varies through the day, after meals, and with stress or illness. A normal reading on a quiet morning can hide spikes that occur after lunch or dinner.
Another common test is A1C. It estimates average blood sugar over about three months. It is useful for routine care. Still, it can read high or low in people with anemia, recent blood loss, pregnancy, kidney disease, or certain hemoglobin variants. In those cases, A1C may not reflect true risk.
Population Differences and Missed Diagnoses
Researchers report that standard cutoffs may perform unevenly across ethnic and racial groups. For example, some Asian populations develop type 2 diabetes at lower body mass index levels and can have high post-meal spikes while fasting values look fine. African and Mediterranean groups have higher rates of hemoglobin traits that can skew A1C. Older adults may also show normal fasting glucose yet meet diabetes criteria during a glucose challenge.
These patterns matter for equity. If a test misses early disease more often in one group, that group faces higher odds of late diagnosis, severe symptoms, and complications. That includes vision loss, kidney failure, and heart disease. Public programs that screen with only one measure risk widening these gaps.
What Guidelines Recommend
Leading guidelines from the American Diabetes Association and the World Health Organization list several accepted screening tools. They emphasize using clinical judgment when results conflict with symptoms or risk factors. Many clinicians pair tests to reduce blind spots.
- Fasting plasma glucose
- A1C
- Oral glucose tolerance test (OGTT)
- Targeted use of continuous or intermittent glucose monitoring to assess post-meal spikes
The OGTT, while time-consuming, often detects impaired glucose handling before fasting readings rise. That can help in pregnancy, in people with a strong family history, and in groups known to have high post-meal spikes.
Inside the Clinic: A Shift in Practice
Primary care teams are adjusting workflows. Some now screen high-risk patients with both fasting glucose and A1C on the same day. If results disagree, they add an OGTT. Obstetric clinics screen earlier in pregnancy for those with risk factors and consider different tests if anemia is present. Community health workers are trained to flag symptoms even when a quick test looks normal.
Insurers and health systems are also reviewing coverage. Adding a second test costs more up front, but early treatment can prevent hospital stays, dialysis, and amputations. Health economists note that smarter screening often pays for itself by avoiding these severe outcomes.
What Patients Can Do
People with a family history, high blood pressure, high cholesterol, or a history of gestational diabetes should ask about the best test for them. If one test is normal but symptoms persist—thirst, frequent urination, blurry vision—patients should request repeat testing or an OGTT.
- Share personal and family history with your clinician.
- Ask if A1C is accurate for you, especially with anemia or a hemoglobin trait.
- Consider an OGTT if fasting values are normal but risk is high.
- Use home meters or short-term sensors to check post-meal spikes when advised.
The Road Ahead
Public health agencies are studying how to tailor screening by age, ancestry, and clinical context. Researchers are testing risk scores that combine age, weight, blood pressure, and simple lab results. Digital tools may help target who needs which test first.
The message for now is clear: one number is not enough for everyone. Using the right test for the right person can catch diabetes earlier and prevent harm.
As programs refine their approach, readers should watch for updated guidelines, insurance coverage for OGTT when indicated, and broader use of paired testing in community settings. Early, accurate detection remains the strongest step to protect sight, kidneys, nerves, and the heart.
Kirstie a technology news reporter at DevX. She reports on emerging technologies and startups waiting to skyrocket.
