It’s good to hear he received a transfusion. Most doctors consider intervention for ribavirin
-induced hemolytic anemia
at around 10.0 g/dL. Many will consider transfusion at 8.5, so your husband was well overdue. Keep in mind that the end-point for hemolytic anemia is cardiac failure; this is something that is can be a serious issue, obviously.
Intervention can consist of dose reduction, dose cessation, Rx with Procrit, Epogen, and Aranesp. These are all forms of human epoetin.