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. 2 weeks to process. 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. $40 lab analysis fee required for standard lab results. Prepaid postage envelope included in kit. Blister pack.