The measurement cartridge was not returned to siemens for evaluation.The data files for instrument sn (b)(4) were provided and reviewed by siemens.The data indicates that a d39 error (obstruction) occurred at the time of the testing of the sample in question which is likely to have caused the lower po2 value.As stated in the rp500 operators guide: when a d39 error occurs, the system detects a problem, such as an obstruction or a sample not detected, and prompts the operator to replace the sample port.If the system is unable to clear the obstruction, it prompts the operator to replace the cartridge.
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