The test ran for less time than it should have
“We collected the kit early because we needed to post it.”
Device instructions state a minimum exposure for a reason: below it, the measurement has not integrated enough time to describe the period it claims to.
Most laboratories will still analyse a short exposure and report a figure. A reported figure is not the same as a defensible one.
Why this matters
What it changes about the decision in front of you.
- A very short exposure is more sensitive to whatever happened in those particular hours, including weather and household behaviour.
- In a transaction, duration is one of the first things the other side checks, because it is recorded on the report.
What it could influence
Where the effect is likely to show, and in which direction where that is knowable.
- The result could sit either side of what the full duration would have produced, and the shorter the exposure the wider that uncertainty.
- Laboratory precision statements assume the stated minimum exposure, so they may not apply.
What this does not settle
What still stands. Noticing a problem is not the same as losing the evidence.
- A short exposure returning a high figure is still evidence that levels are present, and generally worth acting on to the extent of measuring properly.
- The device and laboratory both functioned. The gap is in duration, which is the easiest thing to fix.
- It does not establish that the house is above or below any threshold — that is precisely what is left open.
What a professional is likely to ask
Worth having answers ready. None of these is a test you can fail.
- The actual start and end times, if they were recorded.
- What the device required as a minimum, which is on the instructions.
- Whether the shortfall was hours or days, since those are different situations.
What you can check yourself
Things you can establish today, without anyone visiting.
- The stated minimum on the device instructions, and the dates on the report.
- Whether a repeat is practical within whatever timeline applies.
What genuinely needs somebody on site
Where this platform stops. These are not questions a website can answer about your house.
- Nothing — this one is fully resolvable from the paperwork, which is unusual and worth knowing.
Categories a next step could fall into
Unordered, and none of them is a recommendation. Which applies depends on things this page does not know about your situation.
Related reading
- How testing works — Devices, placement, closed-building conditions, and what invalidates a result.
- When to retest — Every two years, plus after anything that changes how the house meets the soil or how it moves air.
Sources
- U.S. EPA — A Citizen’s Guide to Radon
When you are ready to talk to somebody
Tell us about your home and what you are trying to work out. We will tell you honestly whether we can route it to a provider in your area today.