Yes, and before framing. The EPA advises testing before a major renovation like finishing a basement and again afterward. If a system is needed, planning the pipe route while walls are open beats cutting into new drywall.
More detail
Ohio's standards shape the plan. The fan cannot sit in the basement or any conditioned space, so the pipe has to reach an attic, a garage that is not under living space, or the outside wall, and the route has to leave access to anything that needs service. Exposed pipe gets a RADON REDUCTION SYSTEM label on each floor. If the sump stays in the finished space, its cover must remain removable, clear enough to see the pump, and sealed with silicone. Frame a chase into the plan and keep the floor-wall joint reachable for sealing. After the finish is complete and the house is back to normal, retest the new rooms. See finishing a basement in Columbus.