Estimated HbA1c
eHbA1c estimates what a lab HbA1c test would read on a given day. For each day, it takes the average glucose from every reading in the trailing 90 days and weights each day's contribution by recency. The most recent ~30 days count for roughly half the estimate. The weight tapers off exponentially for older days. This is similar to how glycated hemoglobin reflects glucose exposure over a red blood cell's ~90–120 day lifespan. That weighted average glucose is then converted to NGSP percent with the ADAG formula: eHbA1c (%) = (average glucose in mg/dL + 46.7) / 28.7.
Shown in % (NGSP)
Lab HbA1c draws, shown as triangles on the chart above. They are not included in the eHbA1c calculation.
Enter a lab HbA1c result here. It shows as a triangle marker on the chart above, so you can see how closely the eHbA1c estimate tracks an actual lab draw. Lab results are not included in the eHbA1c calculation itself. The date below is the date the blood was drawn, not the date you enter it here.
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