Investigation conclusion: the customer's observation was not replicated in-house with retention and return products.Retention products were tested with 25miu/ml hcg and three high level hcg urine controls.Retention products showed hcg positive results at read time and met qc specifications.No false negative results were obtained.Returned products were tested with returned urine samples and both samples showed negative results.Returned product was also tested with returned serum sample and a positive result was obtained.Customer's observation was verified.The returned samples were sent to a reference lab and it was observed that the hcg levels in the returned urine samples were less than the detectable levels of the device.However, a negative result with the urine sample is the expected outcome.Therefore, no problem was detected.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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