ERMI & HERTSMI-2 Testing in Utah | Specialty Mold Screening

Standard mold testing identifies what's in the air right now. ERMI and HERTSMI-2 tell a different story.

These DNA-based tests analyze settled dust — the accumulated record of mold activity in a building over time. Rather than capturing a snapshot of current airborne spore levels, they detect genetic material from specific mold species associated with water-damaged buildings, scoring that data against reference populations to estimate the relative mold burden of the environment.

For most homeowners with mold concerns, standard inspection and testing is the right starting point. But for clients working with physicians on CIRS diagnosis, navigating mold-related illness, or evaluating a home after a history of significant water damage, ERMI and HERTSMI-2 provide a layer of environmental data that standard spore testing doesn't capture.

At Utah Mold Pros, these tests are offered as a specialized service — not a default recommendation. Every assessment is performed by Devon Kennedy, a Certified Indoor Environmentalist (ACAC-CIE) with a microbiology background and direct clinical literacy around CIRS and Shoemaker Protocol evaluation. Critically, results are interpreted in context — not handed over as a score without explanation.

We do not remediate. And we'll be honest with you about what these tests can and cannot tell you.

ERMI vs. HERTSMI-2: What Each Test Measures

ERMI (Environmental Relative Moldiness Index) uses quantitative PCR (qPCR) DNA analysis on a dust sample to detect and quantify 36 mold species — 26 associated with water-damaged buildings and 10 commonly found in normal homes. The ratio of those two groups generates an ERMI score, which is compared against a national reference database to indicate relative moldiness.

A higher ERMI score suggests a greater presence of water-damage-associated molds relative to background. It doesn't identify where that mold is, whether it's currently active, or what's driving it.

HERTSMI-2 is a simplified subset of the ERMI panel, focusing on five specific species most strongly associated with CIRS and inflammatory illness: Stachybotrys chartarum, Aspergillus penicillioides, Wallemia sebi, Chaetomium globosum, and Aspergillus versicolor. Each species is scored individually and combined into a total score used within the Shoemaker Protocol framework for evaluating whether a building is safe for a CIRS patient.

HERTSMI-2 is the more clinically targeted of the two — used specifically when a treating physician needs to determine whether an environment poses ongoing risk for a patient with biotoxin illness.

What These Tests Can and Cannot Tell You

Being direct about this matters.

ERMI and HERTSMI-2 were developed primarily for research and epidemiological studies — not routine residential diagnostics. They're useful tools in the right context. In the wrong context, they produce scores that are easy to misinterpret and act on incorrectly.

What they can tell you:

• Whether DNA from water-damage-associated mold species is present in settled dust

• The relative mold burden of the environment compared to reference populations

• Whether specific CIRS-relevant species are present and at what levels

• Historical mold activity that may not be reflected in current air samples

What they can't tell you:

• Where the mold is located or what's driving it

• Whether mold is currently active or from a past event

• Current airborne spore concentrations

• Whether the building is safe for a specific individual without clinical context

• What remediation, if any, is warranted — without physical inspection to support the findings

Scores alone should not drive remediation decisions. A high ERMI score without a corresponding physical inspection to identify source and extent is an incomplete picture. A low score doesn't guarantee the environment is problem-free — particularly for individuals with severe mold sensitivities.

Cleaning habits, dust accumulation patterns, and sample collection methodology can all influence results. This is why professional collection and interpretation matters.

When ERMI or HERTSMI-2 Testing Makes Sense

CIRS diagnosis and Shoemaker Protocol. HERTSMI-2 is a recognized component of the Shoemaker Protocol for evaluating building safety in CIRS patients. If your treating physician has recommended it as part of a clinical workup, this is one of the clearest indications for the test.

Mold-related illness with standard tests that don't explain symptoms. When spore counts are normal but occupants remain symptomatic, ERMI's historical dust analysis can identify accumulated species that current air testing misses.

Post-remediation evaluation for sensitive individuals. For CIRS patients or those with documented mold sensitivities, HERTSMI-2 scoring provides a clinical benchmark for whether a remediated environment has reached acceptable levels for reoccupancy.

Evaluating long-term mold history in a home. Dust accumulates over time. ERMI can reveal a pattern of water-damage-associated mold activity even in a home where visible mold has been addressed or where current air samples appear normal.

Working with a functional or environmental medicine provider. These tests are most actionable when ordered within a clinical framework — when a treating physician has a specific question that environmental DNA data can help answer.

We recommend pairing ERMI or HERTSMI-2 with standard mold inspection and testing whenever possible. The combination provides both the historical picture and the current environmental conditions — and gives the physical source identification that makes any score meaningful. See mold inspection → See mold testing →

How ERMI and HERTSMI-2 Testing Works

Dust sample collection. Samples are collected from settled dust in the home using a standardized protocol — typically from a single composite location or targeted areas depending on the test and clinical question. Collection methodology affects results, which is why professional collection matters more than DIY kits.

DNA laboratory analysis. Samples are processed through a specialized qPCR laboratory that quantifies the DNA of each target species. Results come back as species-level counts and a composite score.

Interpretation and consultation. Results are walked through directly — what the score means, what it doesn't mean, how it fits into the broader environmental picture, and what a reasonable next step looks like given the clinical context. A score without interpretation is not a useful clinical tool.

About Utah Mold Pros

Utah Mold Pros provides independent, certified specialty mold testing throughout Salt Lake County and Northern Utah. Every assessment is performed by Devon Kennedy, a Certified Indoor Environmentalist through the American Council for Accredited Certification (ACAC).

Devon holds a BSc in Microbiology and an MBA, and works directly with homeowners, physicians, and families navigating complex indoor environmental cases — including CIRS evaluation, PANS and PANDAS workups, and Shoemaker Protocol assessment. His approach combines scientific rigor with the clinical literacy needed to make ERMI and HERTSMI-2 findings meaningful in a medical context.

We do not perform remediation, ensuring that every finding is unbiased and every recommendation reflects what the environment actually contains — not what would generate downstream work.

ERMI & HERTSMI-2 Testing Service Areas in Salt Lake County

We serve homeowners, families, and clients working with healthcare providers throughout Salt Lake County — including Salt Lake City, South Salt Lake, Millcreek, Holladay, Murray, Midvale, Sandy, Draper, Cottonwood Heights, West Valley City, West Jordan, South Jordan, Riverton, Herriman, Taylorsville, Kearns, and Magna.

Local. Independent. We come to you.

Schedule ERMI or HERTSMI-2 Testing in Utah

If your physician has recommended ERMI or HERTSMI-2 testing, or if you're evaluating a home in the context of mold-related illness, the starting point is a conversation about what you're trying to learn and whether this test is the right tool.

Call or text (385) 775-2219 to discuss your situation. Free consultations available.

ACAC Certified. Independent. No remediation. No conflicts. Just answers.