XSYSTEMS Dilution Buffer, list number 9519-02; for In Vitro diagnostic use, Bovine gamma globulin in Phosphate buffer, with Sodium Azide as a preservative; 950 mL bottle, 4 bottles per carton; Abbott Laboratories, Abbott Park, IL 60064 USA

Abbott sent Device Correction letters dated 9/1/04 to all customers receiving the TDx/TDxFLx Benzodiazepines assay, list 9674, informing them of the shift in control values and patient results when used with the XSYSTEMS Dilution Buffer, list 9519-02. The letter gave examples of the effects observed in the benzodiazepines assay performance, and listed the following actions to be taken until Abbott completes their investigation: * During the use of a single lot of buffer, recalibrate the TDx/TDxFLx Benzodiazepines assay every 14 days. * Perform a new calibration run on the TDx/TDxFLx Benzodiazepines assay when a new lot number of XSYSTEMS Dilution Buffer is used. * These actions are in addition to the package insert calibration and quality control requirements. * Follow your laboratory procedures for notification of the health care providers that you serve. Any questions were directed to Abbott''s Customer Service at 1-877-4ABBOTT.