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While testing for radon is a reliable way to gauge the radon risk in your home, certain guidelines must be followed to ensure the accuracy of your results. The following is a list of general Do's and Don't when testing for radon. Your radon kit should contain any additional instructions required to use the kit.


  • Follow the instructions that come with your Radon test kit.
  • For short-term tests, close your windows and outside doors at least 12 hours before you begin your test. Keep them closed as much as possible during the test. Do not operate fans or other devices which bring air in from outside.
  • For long-term tests, use the rooms, windows and doors as you normally would, without disturbing the test kit.
  • Operate the home's heating and cooling systems normally during the test. For short-term tests, operate only air-conditioning units that recirculate interior air.
  • Place your test kit in a frequently used room like a bedroom or den on the lowest living area in your home.
  • Place the testing device at least 20 inches from the floor where it will not be disturbed.
  • Leave the test kit in place for the full length of time that the package instructs.
  • Completely fill in the information form on the back of your text kit.
  • Send your test kit to the lab specified on the package immediately after the test period is complete.


  • Conduct your test during periods of severe storms or high winds.
  • Place your test kit in a bathroom or kitchen.
  • Disturb the test kit once it has been placed.
  • Place near heat, humidity or exterior walls.