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eA1c is an estimated value for A1c based on the average Sensor glucose over the timeframe selected. eA1c is calculated using a formula from the published reference below.²⁰¹ eA1c is not meant to replace or predict the A1c tested in a laboratory. Instead, you can use this value to monitor changes to eA1c over time. With the FreeStyle Libre system, a minimum of 5 days of data is required to product an eA1c.