safe blood

Packed red cells and blood products from persons with no known risks for exposure to transfusion-transmissible microorganisms (TTM; e.g., malaria, HIV), which have been fully tested and are negative for TTM by a direct assay of viral products (e.g., HBV surface antigen), by an indirect assay of exposure to viruses (e.g., antibodies to HCV and HIV-1) and by ‘surrogate’ assays (e.g., measurement of transaminases, which are nonspecific indicators of hepatic inflammation)

'safe' blood

Transfusion medicine Packed RBCs and blood products from persons with no known risks for exposure to transfusion-transmissible microorganisms–TTM. See Blood shield laws, Euroblood, Surrogate marker.