An 8-year-old boy with hemophilia A has an infection in the jaw and has already seen his physician. What is the next best step?

INR specifically monitors warfarin/vitamin K-dependent clotting factor activity and is not the relevant test for hemophilia A (a factor VIII deficiency, assessed instead by factor levels/PTT) — making 'get an INR' an inappropriate, irrelevant step here. Since there's an active infection needing prompt management (not something to defer for 2 weeks), the appropriate next step is to proceed toward needed treatment with proper informed consent, having already coordinated with the patient's physician regarding hemophilia management/factor replacement as needed for any procedure.