Investigation conclusion: the customer's observation was not replicated in-house with retention products.Retention products were tested with 25 miu/ml and 100 miu/ml hcg urine controls.Retention products showed hcg positive results at read time for both the controls and met qc specifications.No false negative results were obtained.Manufacturing batch record review did not uncover any abnormalities.Based on the information available, there is no indication of a product deficiency and no corrective action is required.
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