what is the highest a1c ever recorded

The highest recorded A1C levels are typically seen in individuals with uncontrolled diabetes. While there is no definitive record for the highest A1C ever recorded, some case reports have documented A1C levels as high as 18-20%. These extreme levels are rare and usually indicate severe, long-term uncontrolled diabetes, which can lead to life-threatening complications.

• Normal A1C: Below 5.7%
• Prediabetes: 5.7% to 6.4%
• Diabetes: 6.5% or above

If you or someone you know has an extremely high A1C, it is crucial to seek immediate medical attention to manage blood sugar levels and prevent complications.