ARCHITECT STAT Troponin-I Reagent Kit; list numbers 2K41-28 (500 test kit); an in-vitro diagnostic test kit; each kit contains bottles of microparticles, conjugate and assay diluent; Abbott Laboratories, Abbott Park, IL 60064 ARCHITECT STAT Troponin-I is a chemiluminescent microparticle immunoassay (CMIA) for the quantitative determination of cardiac troponin-I in human serum and plasma on the ARCHITECT i System with STAT protocol capability. Troponin-I values are used to assist in the diagnosis of myocardial infarction (MI) and in the risk stratification of patients with acute coronary syndromes (including unstable angina and non-ST elevation) with respect to relative risk of mortality, myocardial infarction, or increased probability of ischemic events.

The lot of Troponin-I is demonstrating a shift in expected results in some cases, and varies from kit to kit. A concentration change of up to +/-55% could occur when switching kits without recalibrating.

The firm, Abbott Laboratories, sent a "Product Recall Immediate Action Required"letter dated April 11, 2012 to all Troponin-I customers who received the affected reagent lot internationally. The customers were directed to determine if they are currently using and/or have inventory of lot 74264UN11; to discontinue use and destroy any remaining inventory of the lot; to follow their facility's policies and procedures for communicating with the heath care providers they serve; to forward a copy of the letter to any laboratory to whom they may have forwarded the reagent; to retain a copy of the letter for their records and to complete and return the Customer Reply Form (sent to Abbott international affiliates via e-mail on 4/11/2012) via fax to: 1-800-777-0051 or e-mail: [email protected]. Any questions were directed to their local Customer Service representative or call the field action coordinator at 847-938-1923 or email: [email protected].