Homeowners can test by themselves using a Radon test kit. This testing method is as simple as following the instructions to set the device out and then send it in to a lab for processing. The lab will then send back a report indicating what the radon levels are in the home. Another method to test is by hiring a certified radon professional. A professional will likely perform a short term test using a Continuous Radon Monitor to measure the radon levels every hour for a 48 hour time period. The most accurate form of testing is a long term test which will last a period of 90 days.