Can a person have CT guided nerve root injection if she is on apixaban?

Usually not. Most practitioners who perform that procedure instruct the pt to d/c the drug several days before. These days, anyone who does that procedure is expected to have a written protocol that includes such details. If you're not asked whether you're on apixaban or other antithrombotics before the procedure & aren't given preprocedure & aftercare printed instructions, call a big time out.