Understanding Your Mold Test Results

Mold reports can look intimidating at first glance: tables, unfamiliar names and plenty of numbers. Start with the laboratory’s summary and recommendation for each sample, then use the detailed results to understand that finding. This guide explains how to read the report—not how to diagnose a building or a person’s health from a number.

Start with the summary and recommendation

For air samples, Sporecyte’s None, Slight and Major categories describe the laboratory’s interpretation of mold elevation. They are not whole-house health grades, and they should be read with the recommendation for that particular sample.

None

The comparison does not identify an elevation in that air sample. None does not mean zero spores, prove that hidden growth is absent or clear every part of the home.

Slight

The laboratory identifies some elevation compared with the outdoor sample and a possible mold or moisture concern. Follow the report’s recommendation for an assessment by a qualified mold professional rather than dismissing a smaller elevation.

Major

The laboratory identifies a stronger concern. In the sample discussed below, the bedroom receives a Major result and the lab strongly recommends a detailed professional assessment for mold and moisture issues. The category is not a medical diagnosis or a universal numerical cutoff.

Compare the types—not just the totals

An outdoor control sample provides context for spores present outdoors at the time of collection. Compare each indoor sample with that control, including the individual mold types and their concentrations. A lower indoor total does not, by itself, mean the result is favorable.

Spores/m³ means spores per cubic meter of sampled air. It expresses a concentration, not a count of every spore in the room. The laboratory groups types associated with damp indoor materials, types found indoors or outdoors, and predominantly outdoor types. Those groups help interpretation; they do not prove where an individual spore came from.

A sample bedroom result: why the lower total is not the whole story

In the sample report used for this guide, the Primary Bedroom total is 413 spores/m³, compared with 3,080 spores/m³ outdoors. Looking only at those totals would miss an important finding: the bedroom contains Stachybotrys at 27 spores/m³, while the hallway and outdoor samples each report 0 for that type.

Eddie identifies that Stachybotrys finding as the reason for the bedroom’s Major result. The laboratory’s interpretation and recommendation remain important even though the bedroom’s total is lower than the outdoor total. The report does not publish its complete grading algorithm, so 27 spores/m³ should not be treated as a universal Major threshold. A reported zero means none was reported in that sample—not proof that the type is absent everywhere.

The sample was collected October 11, 2026. Receipt, analysis and report dates are October 12, 2026. This is an example for understanding a report, not a diagnosis of your property. The report identifies Stachybotrys; it does not establish a particular species or measure mycotoxins.

Air and surface samples answer different questions

An air sample captures material from the air during a limited collection period. A tape or swab examines a particular surface. Do not compare a surface result numerically with an airborne concentration in spores/m³.

Read the surface report’s Fungal Growth and Background Spores findings separately. In this sample, the kitchen-sink tape contains background spores but indicates no fungal growth; the bathtub tape indicates fungal growth. Spores present on a surface and growth identified on that surface are different findings.

Particulate information and microscope images provide additional detail about the collected material. They are not a health clearance, and the microscope images do not locate hidden growth elsewhere in the building.

Know what the report cannot tell you

Results reflect the locations, collection period and conditions sampled. They do not describe every room, hidden cavity or future day. Short-term sampling and negative findings cannot establish a person’s exposure or health risk, and a report cannot certify an entire home as safe, toxic or mold-free.

There are no federal airborne mold limits that turn this report into an EPA pass/fail test. Read the findings alongside moisture history, visible conditions, odors, inspection limitations and the laboratory’s recommendations. Questions about symptoms or individual health risks belong with a healthcare professional.

Practical next steps

Start with the recommendation for each sampled location. Ask which finding led to that recommendation and whether a qualified mold or moisture professional should assess the area. Address the moisture source as well as any identified growth; the laboratory result alone does not define the full scope of repair or remediation.

If something in your report is unclear, ask Eddie to walk through the summary and the relevant rows with you. Learn about our Mold Testing service, return to Resources, or schedule an inspection. Questions before scheduling? Call our office at (270) 223-6741.

Complete sample report (optional PDF)

The complete sample report is available as an optional PDF: 11 pages, approximately 8.4 MB. It is an untagged laboratory PDF, so this readable HTML guide is the primary explanation. The sample is not a report for your property. All original pages, findings and the reproduction notice are retained.

View the complete sample mold report (PDF, 11 pages, 8.4 MB) (opens in a new tab)

Technical references

The explanation above draws on the selected sample report, Eddie’s clarification of its bedroom finding, and these primary sources:

Sporecyte’s published example report (PDF) (opens in a new tab)

Sporecyte’s report-reading guide (opens in a new tab)

Sporecyte’s sampling FAQs (opens in a new tab)

CDC/NIOSH guidance on mold testing and remediation (opens in a new tab)

EPA guidance on mold testing and sampling (opens in a new tab)