The NHSN's Hemovigilance Module primarily collects information on transfusion adverse reactions. Along with a diagnosis of the adverse reaction, the surveillance system, used by more than 150 hospitals to date, requires the user to code for the case definition, severity, and imputability. Imputability, or the strength of the relationship of the transfusion to the reaction, is critical to understanding adverse events. This audioconference will provide an in-depth look at how to use patient records to assign imputability according to the NHSN surveillance protocol. The intended audience for this audioconference is those interested in hemovigilance and adverse transfusion reactions as well as people who are participating in the NHSN.

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