Investigation/conclusion: the customer's observation was not replicated in-house with retention devices.Retention devices were tested with 25 miu/ml hcg cutoff urine control and 3 high level of hcg urine controls (201.4 iu/ml, 204.2 iu/ml and 212.2 iu/ml), all results were hcg positive at read time and met quality control specification.There were no false negative results obtained.Manufacturing batch record review did not uncover any abnormalities.The root cause could not be determined due to insufficient information provided by the customer and without patient specimen in-house analysis.Based on the information available, there is no indication of a product deficiency and no corrective action is required at this time.
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