The lab report came back. The numbers are there. The analyst did their job correctly. And you are still about to make the wrong call.
This is not a lab error problem. It is a sampling and interpretation problem, and it is far more common than most people in this industry want to admit.
"A laboratory result can be analytically sound while the sample itself is poorly representative of the condition you are trying to assess. That is a sampling problem, not an analytical one."
What the Lab Can and Cannot Tell You
A laboratory analyzes what it receives. It counts spores, identifies genera, reports concentrations. That work is technical and generally reliable. But the lab has no idea where in your building the sample was taken, what was happening in the structure at the time of collection, whether the HVAC was running, whether materials had just been disturbed, or what the outdoor conditions looked like that day.
All of that context belongs to the person who designed and executed the sampling strategy. If that person did not account for those variables, the result you get back may be technically accurate and still tell you almost nothing useful about the actual condition of the building.
A non-detect is not proof of absence. A low count is not clearance. A high count does not always mean active amplification. Spore counts alone do not establish whether conditions are safe or unsafe. The number only has meaning inside a larger picture.
Where Sampling Goes Wrong
Most sampling failures fall into a small number of repeatable patterns. Recognizing them is what separates an investigator from someone who just collects samples.
One sample for a large space. A single air sample in a 2,400 sq ft basement tells you what was airborne at that location at that moment. It does not characterize the space.
Sampling after disturbance. If materials were moved, cut, or disturbed before sampling, the result reflects that event, not the ambient baseline condition.
Sampling only the visible problem. Mold does not stay where you can see it. If the objective is to understand what is in the air throughout the building, sampling only the affected room gives you a partial answer at best.
No outdoor control sample. In airborne fungal investigations, outdoor spore populations directly affect indoor readings. Without a simultaneous outdoor sample, you have no baseline for comparison.
Interpretation Needs Context
Even when sampling is done correctly, the numbers do not interpret themselves. What the result means depends on a set of factors that the lab report does not contain.
What interpretation actually requires
- Moisture conditions at the time of inspection and historically in the space
- Building history including prior water events, repairs, and remediation
- HVAC operation during the sampling period and whether the system was distributing or isolating air
- Inspection findings from the physical walkthrough, including staining, odor, material condition, and structural observations
- Sample location and timing relative to the suspected source and any recent activity
- Sampling method whether spore trap, culture, tape lift, or bulk, and what each method is and is not designed to detect
- Organisms detected and whether they are consistent with the moisture history and substrate type found in the space
- Pre- or post-remediation context, which changes what the result is supposed to confirm
Even genera that are commonly associated with water damage, like Stachybotrys or Chaetomium, are most informative within this broader picture. Finding either on a surface swab near a long-term wet substrate means something different than finding trace levels in an air sample in a dry room with no visible damage.
Why This Matters for the Decision You Are Making
Most people who get a mold test have a specific question they need answered: Is there a problem here? Is the remediation complete? Is it safe to move back in?
Those are decision questions, not data questions. The lab gives you data. Turning that data into a reliable answer to a decision question requires someone who understands how the sample was collected, what the building conditions were, and what the result means in that context.
Before asking "what did the lab find," ask "was the sampling strategy designed to actually answer my question." Those are different questions, and the second one determines whether the first one matters.
"The inspector who also understands testing sees things the generalist misses. The sample location, the timing, the method choice, the outdoor comparison, the building conditions at collection, all of it shapes what the number actually means."
How SBG Approaches Testing
At Sick Building Group, testing is not a standalone service. It is part of an investigation. When I design a sampling strategy, it is built around the specific question the client needs answered, the physical conditions I observed during the inspection, and the building science of how air moves through that particular structure.
That means considering which spaces need to be sampled and which do not, whether conditions are appropriate for collection, what method produces useful data for this type of problem, and how to set up the outdoor comparison so the indoor results can actually be interpreted.
The result you get back should narrow the decision, not create more questions. If your last mold test left you less certain than before you started, the issue was likely not the lab.
Testing Without Interpretation Is Just Data
If you have a mold test result that raised more questions than it answered, or if you are trying to decide whether to test and who should do it, call or text Anthony directly. A 10-minute conversation about your situation is free.
(404) 268-0979: Call or TextAnthony Denatala, CMRS
Owner and Lead Investigator, Sick Building Group, LLC. Twenty-plus years in environmental diagnostics and structural remediation. Certified Mold Remediation Specialist. Kennesaw, GA. (404) 268-0979sickbuildinggroup.com