What is ERMI testing?

ERMI stands for Environmental Relative Moldiness Index. It's a DNA-based test of settled dust that quantifies the mold burden in a home relative to a national reference set. Healthcare practitioners (especially naturopathic, functional, integrative, and environmental medicine) often request it to document or track a patient's environmental mold exposure over time.

How is the ERMI sample collected?

Settled-dust samples are collected from designated areas of the home (typically the master bedroom and main living area) using a specialized vacuum cassette. The cassettes are sealed, chain-of-custody documented, and shipped to an ISO/IEC 17025-accredited lab for DNA-based analysis.

Olympic Peninsula · Healthcare-supervised mold tracking

ERMI Testing on the Olympic Peninsula.

Environmental Relative Moldiness Index testing for clients working with naturopathic, functional, integrative, or environmental medicine practitioners. DNA-based dust analysis at an ISO/IEC 17025-accredited lab. Affordable, accessible, and straightforward.

Book ERMI Testing Or call (360) 670-3367

ISO/IEC 17025 lab DNA-based analysis No upselling, ever

DNA Based dust analysis

36Mold species panel

5-10 dayLab turnaround

ISO 17025Accredited lab

What ERMI Testing Actually Measures

ERMI is a DNA-based test of settled dust that quantifies your home’s mold history. It’s designed for documentation and tracking — not for identifying active leaks.

DNA-based mold quantification

The lab uses qPCR to detect and quantify the DNA of 36 specific mold species in a settled-dust sample. Because dust accumulates over months, ERMI reflects historical mold burden rather than just what’s in the air on inspection day.

Comparative scoring

Your home’s ERMI score compares the relative concentration of water-damage-associated molds vs. common indoor molds, then ranks the result against a US national reference dataset of homes.

Healthcare documentation

Naturopathic, functional, integrative, and environmental medicine practitioners often use ERMI to document patient mold exposure as part of a broader workup. The written report is formatted for sharing with your practitioner.

Who ERMI Testing Is Designed For

ERMI is a specialized test for specific use cases. Most homeowners don’t need it — a Complete Mold Inspection is the right starting point. ERMI is the right call when:

Working with a practitioner

You’re working with a naturopathic, functional, integrative, or environmental medicine practitioner who has requested ERMI as part of evaluating mold exposure.

Tracking remediation success

You’ve completed remediation and want to document the change in mold burden over time. Pre/post ERMI is a common protocol for verifying remediation effectiveness.

Buying or relocating

You’re evaluating a new home and want a quantitative baseline of historical mold burden — especially when you’ve had mold-related health issues in the past.

How ERMI Testing Works

Simple, healthcare-aligned process from booking to written report.

Book online or call

Tell us if you’re working with a practitioner or doing this independently. Same-day reply.

On-site dust collection

Settled dust collected from the master bedroom and main living area using a specialized cassette. Quick, non-invasive visit.

Lab DNA analysis

Cassettes ship to an ISO/IEC 17025-accredited lab for qPCR analysis of 36 mold species. Results in 5 to 10 business days.

Written report delivered

Plain-English report with raw lab data attached, formatted for sharing with your practitioner.

ERMI Testing FAQ

The questions we get most often when patients and practitioners are deciding whether ERMI is the right test.

ERMI stands for Environmental Relative Moldiness Index. It’s a DNA-based test of settled dust that quantifies the mold burden in a home relative to a national reference set. Healthcare practitioners often request it to document or track a patient’s environmental mold exposure over time.

A standard mold inspection identifies whether mold is present at the time of testing. ERMI quantifies a home’s mold history by analyzing settled dust — which accumulates over months. ERMI is more useful for medical documentation; a standard inspection is more useful for active problem identification or real estate.

No referral is required to book with us, but results are most useful when interpreted alongside a healthcare practitioner familiar with environmental medicine. We can refer you to naturopathic or functional medicine practices in the area if you don’t already work with one.

Settled-dust samples are collected from designated areas (typically master bedroom + main living area) using a specialized vacuum cassette. Cassettes are sealed, chain-of-custody documented, and shipped to an ISO/IEC 17025-accredited lab for DNA analysis.

Lab analysis typically takes 5 to 10 business days from sample arrival. We provide a written, plain-English report alongside the raw lab data so you and your practitioner can interpret the results without translating lab jargon.

Yes — and it’s often the right move. The Complete Mold Inspection identifies active sources; the ERMI test quantifies historical burden. Combining both gives your practitioner the complete picture in one visit, and the on-site travel fee only applies once.