Radon testing is not a complicated process, but procedures must be followed if you want an accurate, reliable result. So, if you purchase a quality device, and if you read and follow the instructions, a "do-it-yourself" test kit should be adequate. Follow-up measurements should be made to confirm an elevated radon level. People involved in real estate transactions often prefer to hire a professional to provide an independent measurement of the radon level in the home in question.