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A united states (us) customer contacted a siemens customer care center (ccc) and reported that a falsely elevated total human chorionic gonadotropin (thcg) result was obtained on a patient sample on an atellica im 1300 analyzer.Calibration was acceptable and quality control (qc) was recovered out of range.A siemens customer service engineer (cse) was dispatched to the customer's site.During the visit, the cse inspected the instrument, ran auto check, found clog in vacuum line near the pressure regulator, removed clog and reset vacuum pressure.Then, the cse reviewed system message log which showed error in the dark counts signal, removed, cleaned and reinstalled lumo and photomultiplier tube (pmt), and restarted the analyzer.Next, the cse replaced lumo housing, performed alignments, replaced regulator and elevator, performed sample probe alignments, adjusted secondary vacuum pressure, ran full auto check, daily maintenance, qc and patient correlation, which passed.Siemens is evaluating the event.
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