Siemens Healthcare Diagnostics Inc. has confirmed an issue through complaint investigation. The issue has the potential to affect the recovery of po2 in quality control (qc) at elevation with barometric pressures <730 mmhg on epoc sensor configuration 41.1, epoc host 2 sw version 3.37.3 and epoc nxs host sw version 4.10.6, which were released on 17 October 2022. Recall start date: December 19, 2022