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The customer reported about false negative antibody screening results for anti-jka using biotestcell -i 11 plus on tango infinity, whereas on immucor analyzer the antibody screening and panel results were reported to be positive (3+).The customer called in stating she ran new patient antibody screen on both tango infinity's on site.The antibody screen was negative.When the sample was ran on the immucor echo the antibody screen was 3+ positive.The antibody panel performed on the immucor echo was positive and demonstrated an anti-jka.The antibody panel used on tango infinity s/n (b)(4) was biotestcell-i 11 plus lot #8815011-00.The results were negative.The customer did neither provide the patient samples had caused discrepant results for investigational testing nor the allegedly defective lot of biotestcell-i11 plus.Therefore our quality control laboratory tested their retained sample of biotestcell-i11 plus with different samples and controls (e.G.: anti-d, anti-jka) on tango infinity.The reagents that were used for testing on customers site were also used for qc testing.All test results were as expected, all positive reactions were clearly positive, no irregularities were found.Testing by our quality control laboratory confirmed that the allegedly defective lot of biotestcell-i11 plus functions correctly.A review of the batch record documentation showed no irregularities which might have negatively affected the quality of the allegedly defective lot.The instrument has been newly installed at the customer's site.The log files did not show any issue relevant abnormalities.The positive and negative solidscreen ii quality control resulted as expected.Other samples with positive antibody screen and panel results from the lab journal meet the criteria for the positive result evaluation.The most recent field service reports from may 18, 2018 states that the instrument is working within specifications.
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