A blood gas sample tested from a patient was low on the bicarb.He was then taken to the er and given bicarb as treatment.The patient was released and sent home with more bicarb to take.When the operator saw the blood gas results of the patient run on another analyzer, a difference in values was seen.The therapists went to the er to check on that patient to find out that the patient had already been released.They requested the patient to return for a repeat blood gas and marked the analyzer to not be used until it can be checked/repaired by a field service engineer.A field service visited the site to evaluate the analyzer.The engineer reviewed the analyzer logs and observed the ph and pco2 parameters had failed external quality checks (qc).Results from these parameters are used in the derivation of bicarb.Further review determined that the qc lockout feature was not active on this analyzer.The qc lockout feature would have disabled analysis on the ph and pco2 parameters in the event of a qc failure.The service engineer also observed corrosion on the sensor connector board.Corrective action: replaced sensor connector board due to observed corrosion.The engineer activated the qc lockout feature which will prevent blood analysis on parameters that experience external qc failure.The sensor cassette that experienced the external qc failures was replaced.Following replacement blood samples compared favorably with a comparison analyzer.The operator agreed those were acceptable results.
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