IVIG can passively transfer donor Ab including 'clinically significant' e.g. HBcAb @OchsnerHospMed 123 pts HBcAb+ post-IVIG 37 had HBcAb- captured pre-IVIG of those, 22 received prob unnecessary antiviral Rx Be smart: pre-IVIG, anticipate - test HBV #ACR21 ABST1528 @RheumNow