Siemens has completed the investigation: data from the customer's rp500e systems s/n (b)(6) were reviewed.The po2 sensor on system (b)(6), appears to be functioning as intended.There is no evidence that the po2 was malfunctioning.The po2 sensors had no d2 drift error or d3 slope errors on either rp500e systems.Aqc results were all within value assignment limits.The discrepancy may be due to an air bubble.The pairs of samples were always taken from same syringe and in each case the original sample was run rp500e (b)(6) followed by rp500e (b)(6).When a syringe is run on the rapidpoint systems, air is pulled into the syringe to replace the blood that was pulled into the system.If the air bubble is not expelled, the po2 readings will increase as it equilibrates with air.The co-ox oxyhemoglobin results also increase as did the po2 sensor giving a higher result for the sample run at 8:12 am, 9:56am and 9:59 am.Since the oxyhemoglobin result on system (b)(6) was also higher than system (b)(6), this indicates the o2 sensor was responding to the oxygen present in the sample.The root cause of this event is unknown.
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