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The patient sample may become contaminated because the wax plug, intended to protect the sample from contamination during collection, may be missing.
Inaccurate infusion rate-administration sets which are used with selected infusion pumps may have a defect which does not allow the pump valve to close completely.
There is the possibility of high results with sera expected to have non-detectable levels of tPSA if these reagent lots are used in combination on the Modular Analytics E170 analyzer.