Put the test kit in a room that is used regularly, but NOT in your kitchen or bathroom. Keep the test in place for as long as the instructions say, but for at least 48 hours. Then, re-seal the package and mail it to the laboratory mentioned on the package. Results should be sent to you within a few weeks. Keep doors and windows closed as much as possible during the test.
Drafts can affect the test results.
You can do this follow-up test yourself, or you can contact the owner about the owner doing further testing. The Appendix contains an excerpt from EPA's Citizen's Guide to Radon , which explains more about follow-up testing. If you have questions about what your test results mean, contact your state radon office . Fixing a radon problem usually involves repairs to the building. However, if your home has high radon levels, you can take steps to see that the problem is fixed.