Customer's observation was not replicated in-house with retention and returned devices.Returned and retention devices were tested with cutoff urine and serum controls.All results were positive at read time.No false negative were obtained.Manufacturing batch record review did not uncover any abnormalities.Root cause could not be determined without patient specimen in-house analysis.Based on the information available, there is no indication of a product deficiency.No corrective action is required at this time.This issue will be subject to tracking and trending.
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