The customer compared results that were taken three weeks apart.No comparative testing was performed at the time the disrepant result was received.The customer stated that they expected a result closer to that received previously due to the patient's clinical picture.The customer also stated that expired capillary tube were used to obtain the sample.Siemens reviewed in-house performance data of the lot in question and found no product deficiencies.Additionally, it was noted the customer was using earlobe capillary samples.The process of capillary collection may change po2 levels significantly and is susceptible to factors such as air contamination.According to clsi c46-a blood gas and ph analysis and related measurements; approved guideline, arterial blood samples are preferred for blood gas analysis.
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