(b)(4).The medical device expiration date is unknown as the lot number is unknown.The device manufacture date is unknown as the lot number is unknown.Device evaluation: result - a sample was not returned for evaluation.A review of the device history record cannot be completed as the lot number was not provided for this incident.Conclusions - as there was no actual sample returned for evaluation, an absolute root cause for this incident cannot be determined.If a sample is returned for evaluation, an investigation will be performed and a supplemental report filed.
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