Although there are do-it-yourself testing kits on the market, it is highly recommended that you have a trained professional perform the formaldehyde testing. These home testing kits can only give you a relatively vague idea of the levels in your home or business. A professional formaldehyde testing company will have proper testing equipment which will improve the accuracy of the testing process. The results that come back from a professional laboratory will be highly accurate which is important when attempting to locate the source of this potentially harmful gas.