Hep, Hep, Hepatitis!

65 year old female with a history of steroid dependent pemphigus vulgaris would like a second opinion on treatment options. Upon review of her medical records, the rheumatologist discovers she has a history of positive hepatitis B core antibody and refers her to hepatology clinic for further workup. 

Her rheumatologist would like to start her on rituximab and would like to know if this can be initiated immediately. What do you do next?