Yes. The EPA says every new home should be tested as soon as possible after move-in, even one built with radon-resistant features. If it reads 4 pCi/L or more, a fan can usually be added to the builder's passive pipe.
More detail
New subdivisions around Powell, Lewis Center, Marysville, Plain City, and the Intel growth area near Johnstown often include some radon-resistant features: gravel under the slab, plastic sheeting over it, sealed openings, and a 3- or 4-inch vent pipe from under the slab to the roof, sometimes with an attic junction box for a future fan. Ohio's radon licensing law exempts that builder work during construction, so the builder is not doing licensed radon work and may never test the finished house. A passive pipe on its own also does less than a fan: the EPA puts passive sub-slab suction at 30 to 70 percent reduction and active suction at 50 to 99. Adding a fan later counts as mitigation under Ohio rules. See what a pipe with no fan means.