A sample from the patient was submitted for investigation.The high ft3 and ft4 results were reproduced.Further investigation of the sample determined the patient's sample contained an interfering factor to the ruthenium component of the reagent.This interference caused the patient's high ft3 and ft4 results.Product labeling states: "in rare cases, interference due to extremely high titers of antibodies to analyte-specific antibodies, streptavidin or ruthenium can occur.These effects are minimized by suitable test design.For diagnostic purposes, the results should always be assessed in conjunction with the patient¿s medical history, clinical examination and other findings." the investigation did not identify a product problem.
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