According to the EPA, 1 out of 15 homes has high levels of radon gas. The long-term radon gas analysis will measure the average radon level in your home over an extended period of time (3 months to 1 year), utilizing Alpha-Track technology. If initial testing from short-term detector, such as used for real estate transactions, identifies high levels, a long-term follow up test may be warranted. Lab analysis is included in this safe and simple to use DIY test kit. Blister pack.