(b)(6).Results: (b)(4) samples were returned by the customer in support of this complaint, so they were draw tested with deionized water.From this testing it was determined that all (b)(4) tubes drew below specification, between 4.181 and 4.234 ml.(b)(4) photos were also attached showing 2 tubes, 1 containing less blood than the other.A review of the device history record revealed no irregularities during the manufacture of the reported lot # 5334791.Conclusion: no definitive root cause could be established for the reported defect.
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