Three falsely elevated factor xi results were obtained on a patient sample on a bcs xp system using dade actin fsl activated ptt reagent.The sample was then repeated three additional times and the results recovered lower.Two days later, a new sample from the patient was collected and was run for factor xi three times, each time recovering falsely elevated.The elevated factor xi result was reported to the physician(s), and the physician(s) questioned the result.Three days later, the sample was rerun for factor xi three times, and recovered lower.There are no known reports of patient intervention or adverse health consequences due to the erroneous factor xi results.
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