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Differences between GMI and A1C. An A1C is based on red blood cell turnover and provides an average of blood glucose levels over two to three months, since that’s how long it takes for new red blood cells to form. For this reason, your A1C level is usually only obtained quarterly.
Dr. Edelman explains the difference between the laboratory A1c test and the GMI (glucose management indicator) from a CGM report.
While A1C is currently the primary measure guiding glucose management and a valuable marker of the risk of developing diabetes complications, we believe that the GMI along with the other CGM metrics provide for a much more personalized diabetes management plan.
The GMI is not the same as the A1C. An A1C test measures your blood sugar levels over the past 3 months, so your A1C level reflects the average over that long time period. More...
While A1C and GMI results may differ, it is an important comparison to have a bigger conversation about overall diabetes management. If someone has CKD, it is expected that the A1C will be falsely lower than actual glucose averages. GMI would help fill in the gaps created by that limitation.
Understanding the differences between GMI and A1C is crucial for effectively managing Type 1 Diabetes and tailoring personalized treatment plans. A1C measures average blood glucose levels over 2-3 months based on red blood cell turnover, while GMI can be checked more frequently using CGM data.
Help diagnose Type 2 diabetes. Get an idea of how well your management plan is working if you have Type 2 diabetes or Type 1 diabetes. Your A1C level can help you and your provider know if you need to change your treatment strategy. Healthcare providers do A1C tests in one of two ways:
Dr. Price said, “Loosening control by raising A1C or GMI may not diminish hypoglycemia or risk of severe hypoglycemic events and may result in excessive hyperglycemia.”
GMI indicates the average A1C level that would be expected based on mean glucose measured in a large number of individuals with diabetes. Mean glucose ideally is derived from at least 14 days of CGM data. The GMI may be similar to, higher than, or lower than the laboratory A1C.
A1C is based on a single blood sample and reflects the impact of glucose levels over time. Those other averages are based on individual readings taken over time. With a CGM, the average can...