This report is being submitted retrospectively as part of internal review.Transmitter was the initial suspected device, however, upon reviewing user's data in dms, a decline in sensor performance was observed thus the sensor was requested to be returned for further investigation.The user's complaint of mismatches between sensor glucose readings and blood glucose readings was confirmed via data review in data management system (dms).When the returned sensor was investigated, the in-house testing did not reveal any issue with sensor performance.Since the issue reported by the user could not be replicated in the in-house testing, the exact root cause could not be determined.Based on historical data of similar incidents, the potential root cause could be attributed to lack of hydration of chemical component of the sensor.
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