ARCHITECT Cyclosporine; an in-vitro diagnostic chemiluminescent microparticle immunoassay (CMIA) for the quantitative determination of cyclosporine in human whole blood Distributed by Abbott Laboratories, Diagnostics Division, Abbott Park, IL 60064 USA; list 1L75-25. The ARCHITECT Cyclosporine assay is a chemiluminescent microparticle immunoassay (CMIA) for the quantitative determination of cyclosporine in human whole blood on the ARCHITECT i System. The ARCHITECT Cyclosporine assay is used as an aid in the management of heart, liver and kidney transplant patients receiving cyclosporine therapy.

The ARCHITECT Cyclosporine assay has the potential to generate falsely elevated or depressed results with patient samples due to precision exceeding the Package Insert claim of <15% total CV. Calibrators and Controls also have the potential to be impacted by the assay imprecision.

Abbott Laboratories sent a "PRODUCT RECALL" letter dated October 7, 2011 to all affected customers. The letter describes the product, problem, and actions to be taken by the customers. The letter instructs customers to only run ARCHITECT Cyclosporine using Reaction Vessel (RV) lots manufactured with the same resin as follows: a) RV lots beginning with lot 06083P100 and higher can be used together or, b) RVs lots lower than 06083P100 can be used together. Any RV lot number that does not begin with a zero (e.g. 90032P100) should also be considered lower than 06083P100. Further instructions were included for the accounts to follow when running ARCHITECT Cyclosporine assays. A Customer Reply form was provided to customers to complete and return via fax at 1-800-777-0051. Customers can contact Abbott Customer Service at 1-877-4ABBOTT for questions regarding this notice. A second letter was sent to the accounts on 11/23/11 to simplify the instructions for identifying the Architect Reaction Vessel lots that can be used together for use with the Architect Cyclosporine assay.