Validity check · source-linked
Is My Radon Test Valid?
Check six common radon testing problems: device type, placement, duration, closed-house conditions, interference, and laboratory handling.
Direct answer
Check the procedure—not the radon number. Confirm the device, placement, exposure time, house conditions, handling, and laboratory submission. Any missing or conflicting detail tells you exactly what to verify next.
Reviewed September 5, 2026. United States federal guidance. Device instructions and applicable state requirements take precedence.
Evidence standard
Built from the official primary guidance linked on this page.
Source check
Reviewed September 5, 2026 · maintained by RadonVerdict.
Confirm the device and its instructions
Identify whether the test was short-term, long-term, or a continuous monitor. Find the package, laboratory sheet, or report that states its exposure and handling requirements.
If the device type is unknown, duration and handling cannot be checked reliably. Recover that information before treating the record as complete.
Reconstruct where the device sat
Check the level, room, approximate height, and nearby conditions. A kitchen, bathroom, closet, storage nook, draft, heat source, high humidity, or frequent handling can conflict with general EPA placement guidance.
The device's instructions remain the final reference because different technologies can have different placement limits.
Check the complete exposure period
Use exact start and stop times. CDC defines short-term as 2–90 days and long-term as more than 90 days, but the device can set a narrower window.
For a short-term real-estate test, also review EPA's closed-house checklist. If occupants or the tester cannot confirm the required conditions, the transaction guide says another test may be appropriate.
Look for movement, covering, unplugging, or late mailing
EPA says the device should not be disturbed. Passive kits also need to be resealed and returned according to the laboratory directions after the exposure ends.
Record uncertainty plainly. The right output may be “procedure may be compromised” rather than a false valid/invalid verdict.
Turn this page into evidence
Build a procedure record
Check only what you can confirm. The summary keeps unresolved items visible instead of converting uncertainty into a pass.
Open the full test plannerCommon questions
Quick answers
Can a radon result look normal but come from a bad test?
Yes. The number alone does not prove the procedure was followed. Review placement, duration, conditions, and handling separately.
How can I check my radon test procedure?
Enter the device, placement, duration, house conditions, and handling details in the RadonVerdict planner. It will flag conflicts against its published EPA- and CDC-linked rule set.
What should I do if I cannot confirm the test conditions?
Keep the uncertainty in the record and consult the device provider, laboratory, qualified tester, or applicable state program before relying on the result.
Evidence boundary
Official sources used
Turn guidance into a record