A discordant, falsely elevated total prostate specific antigen (tpsa) result was obtained on a patient sample on a dimension exl 200 system.This result was reported to the physician(s).The same sample when first processed on the same day had recovered a below assay range value.The physician did not question the discordant falsely elevated result which was obtained on a dilution of the same sample made with a control material.A positron emission tomography (pet) scan was performed on the patient.There are no known reports of adverse health consequences due to the discordant, falsely elevated tpsa result or the pet scan.
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