How to Make a Radon Sampling Plan

On this page (10 sections)

1. What should a radon sampling plan include?
2. Where should you place the detector?
3. How long should you collect a radon sample?
4. What conditions should stay consistent during sampling?
5. How should you record and label the sample?
6. When should you run another radon test?
7. How do you make a sampling plan for a basement?
8. How do you make a radon sampling plan for more than one room?
9. What does the result tell you, and what should you do next?
10. How should you choose supplies for a radon sampling plan?

A radon sampling plan sets the detector location, sampling period, and recordkeeping steps before you begin. Follow the test instructions, keep the setup consistent, and save the result with the room and test dates.

Start by deciding what question the test should answer. A screening test in the lowest regularly used level is a practical first step, while a follow-up test may be needed to confirm a result or assess a different part of the home.

For the basic setup and testing steps, see How to Test for Radon: The Simple Answer. This plan helps you organize those steps and preserve the details that make a result useful.

What should a radon sampling plan include?

A useful radon sampling plan records where, when, and how you test. Include enough detail to repeat the setup or explain any change.

Write down:

• The room and floor where the detector will sit.
• The detector’s position in the room, such as a table or shelf.
• The test method and device instructions.
• The planned start and stop dates and times.
• Any events that may have changed the test conditions.
• The result, date received, and any follow-up action.

Keep the record with home maintenance documents. If you later test again, the first record makes it easier to compare locations, dates, and test methods without relying on memory.

Where should you place the detector?

Place the detector on the lowest level that people regularly use or could use as living space, unless the test instructions or local guidance specify another location. A basement used as a family room is a stronger starting point than an unfinished space used only for storage.

Choose a spot where the detector can remain undisturbed for the full sampling period. Keep it away from open windows, exterior doors, fans, vents, direct sunlight, and areas with high humidity when the device instructions call for those precautions.

Don’t place it in a kitchen, bathroom, laundry room, or closet unless the instructions say that location is suitable. Routine moisture, airflow, and activity can make these spots poor choices for a consistent sample.

For a home with several occupied levels, begin with the lowest regularly used level, then consider another test if you have a specific reason to compare floors or rooms. Write down why you chose each location.

How long should you collect a radon sample?

Use the sampling period stated in the test instructions. Different devices and methods have different exposure times, so don’t substitute a familiar schedule from another kit.

Set a reminder for the planned end time. If you use a short-term test, record when it began and when it ended, then follow the packaging and return steps promptly.

The First Alert Radon Gas Test Kit is designed for an initial screening and includes test materials and lab fees, excluding New Jersey state fees. Results are emailed within 72 hours of lab receipt.

If you need a short-term test with a stated 48-hour collection period, the PRO-LAB Radon Test Kit for Home is one option. It includes lab analysis and email or text updates.

Neither kit replaces careful setup. Follow the instructions for the device you choose, including when to start the test and how to send the sample.

What conditions should stay consistent during sampling?

Keep the home in the conditions required by the test instructions throughout the sampling period. Short-term tests may require closed-house conditions, so check the kit guidance before opening windows or changing ventilation.

Avoid moving the detector once the test begins. Don’t place it near a fan, open window, or door that will be used often, and note any unusual event that could have affected the sample.

If the room becomes unusually warm, humid, or disrupted, check the instructions for next steps and record what happened. Don’t guess whether an interruption invalidates the sample; the lab or test instructions are the right source for that decision.

When you are also checking for moisture or mold, coordinate the schedule so one project does not change the test room conditions. This guide to mold and radon testing covers planning both checks in one home.

How should you record and label the sample?

Record the detector location and exact sampling dates and times before sending it to the lab. Add the kit or method name so the result remains tied to the right instructions.

A simple log can include:

Use the room name you would use again, such as “basement family room” rather than just “basement.” If you run multiple samples, label each one clearly and avoid mixing the return materials.

The Leaping Lynx Radon Test Kit for Home has a stated 48-hour exposure period and includes a return mailer, though postage is required to return the detector. Its instructions and registration materials can support a straightforward sample record.

When should you run another radon test?

Run another test when the first result, a change to the home, or the test conditions call for more information. Keep the first report so you can compare the next test with it.

A follow-up may be useful after a result near an action threshold, after major renovations, or when you change how a basement or lower level is used. Use appropriate local health guidance to interpret a result and decide on next steps.

Testing frequency also depends on the home and what has changed. See how often should I test for radon for situations that can prompt another measurement.

If you are preparing for a property transaction or arranging a professional visit, clarify who will choose the test location and how results will be shared. [What Is a Radon Inspection?

What It Means](/what-is-a-radon-inspection/) explains what an inspection may cover.

How do you make a sampling plan for a basement?

For a basement, identify whether it is regularly used or could be used as living space, then choose a suitable spot within that area. Follow the test instructions for distance from walls, doors, windows, and other sources of airflow.

Don’t assume a utility corner is representative if people spend time in another part of the basement. Choose a location that fits the purpose of the test and note the room use in your log.

If the basement is unfinished and used only for storage, local guidance may help determine whether and where to test. Keep that decision in the record, especially if the space could later become living space.

How do you make a radon sampling plan for more than one room?

Test more than one room when you have a clear comparison question, such as checking a lower level and a frequently occupied upper room. Use separate detectors and separate records so each sample stays tied to its location.

Where possible, start tests at the same time and follow the same conditions. Don’t combine separate sample results into one number; each result describes its own location and period.

Use a simple label such as “A: basement family room” and “B: first-floor bedroom.” Keep the labels on your notes, packaging, and saved result copies.

What does the result tell you, and what should you do next?

A radon test result describes the sample location and sampling period, not every room or every day in the home. Use the report and current guidance from your local or national health authority to understand what action it calls for.

If the result is raised, follow the report’s next-step guidance and consider confirmatory testing or a qualified radon professional. Don’t make a major decision from an incomplete sample record or a test that may not have followed its instructions.

Store the report with your log, including the exact location and dates. That record can help a professional understand how the measurement was taken.

How should you choose supplies for a radon sampling plan?

Choose the test method based on the question you need answered and the instructions you can follow. The First Alert kit suits an initial screening, while PRO-LAB and Leaping Lynx offer stated 48-hour short-term collection periods.

Before starting, write the test location, timing, and return deadline in one place. Follow the kit instructions, keep the detector undisturbed, and save the result with its sample record.

For a repeat test, use the same room and similar conditions when that is appropriate to your question. If your goal is to check a changed space, record the reason and treat it as a separate measurement.

Frequently asked questions

What should a radon sampling plan include?

A radon sampling plan should identify the room and exact detector location, the test start and end times, and the instructions for keeping the area suitable during sampling. Record the detector or kit name, any interruptions, and the result so you can interpret it and decide whether follow-up testing is needed.

Where should I place a radon detector?

Place a detector in the lowest level of the home that people use or could use as living space, following the test device's instructions. Choose a spot away from drafts, direct sunlight, high humidity, and routine disturbance when the instructions call for those precautions.

How long should a radon sample run?

The sampling period depends on the test method and device instructions. Short-term tests often run for a few days, while long-term tests measure over a longer period; record the exact start and stop times and don't extend or shorten the period unless the instructions allow it.

Should I test every room for radon?

Usually, begin with a test in the lowest regularly used level, rather than placing detectors in every room. Test additional areas when room use, a planned renovation, a real estate question, or an initial result makes more information useful, and follow local guidance for choosing locations.