The Oldest, Most Experienced & Most Respected Radon Company In America.Professional House Doctors Inc. Serving The Entire Quad-Cities Area. Helping Families Improve And Saves Lives Through Science And Technology. Our company provides the fastest and most accurate radon testing services available. We also provide free advice and free consultations for anyone that would like to do their own testing. Our substantial investment in equipment and radon testing technology, more than anyone else in the entire industry, allows us to provide every type of radon test.