System was used for treatment.Kit lot d744 was reviewed.There were no non-conformances related to the complaint.This lot met all release requirements.The uvadex lot number was not provided as it was not administered.However, a review of all uvadex lots manufactured since january 2013 was performed.No trends or nonconformances related to the complaint were noted.Trends were reviewed for complaint category clot observed and no trend was detected for this category.This assessment is based on information available at the time of the investigation.After multiple attempts from therakos' to obtain further information regarding this event, it is unknown as to where the clot was specifically located, hence out of the abundance of caution, this event is being reported.No product was returned by the customer for investigation; therefore, it could not be determined if this specific product met specification.Complaints are monitored through tracking and trending.If a trend is detected, further investigation will be conducted.(b)(4).Device not returned.
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