pO2 D999 membrane units. Distributed by Radiometer America, Inc., Westlake, OH 44145 pO2 membrane units, ordering number 942-042 Intended use is in vitro testing of samples of whole blood for pO2 (partial pressure of oxygen).

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RADIOMETER became aware that the regarded lot pO2 units 942-042R0971 were produced with inner solution for pCO2 membrane units. This solution is a salt solution similar to the pO2 inner solution, but also contains glycerol which can be reduced at the cathode causing a suddenly rising zero current, causing the membrane unit to fail the following Cal2 calibration.