You searched for mold testing techniques because you suspect something is wrong in your home — or you want to make sure nothing is. Either way, you deserve more than a four-paragraph overview written in 2018 that tells you swabs exist and air sampling is good.
This guide covers every mold testing technique available today, explains exactly what each one does and does not tell you, describes when each method is appropriate, and gives you the framework to understand what your inspector is doing and why. By the end, you will know more about mold testing methodology than most homeowners ever learn — and you will be equipped to ask the right questions before you spend a dollar.
For Los Angeles homeowners specifically, this guide also addresses how the city’s unique environment — coastal humidity, aging housing stock, post-wildfire water intrusion, and tightly sealed Title 24 construction — shapes the mold testing decisions a good inspector makes.
First: Why Mold Testing Technique Selection Matters More Than Most People Realize
The single most common mistake in residential mold assessment is using the wrong testing method for the situation at hand — or using only one method when the problem requires several.
A swab sample taken from a visible stain tells you what species of mold is on that surface. It tells you nothing about what is floating in your air, what is growing inside your wall cavity, or whether the contamination has spread beyond the visible area. An air sample tells you what spores are airborne throughout a room but cannot identify which surface or hidden reservoir is the source. Neither method alone gives you the complete picture.
Professional mold assessment is not about choosing the best single technique. It is about selecting the right combination of techniques for the specific situation, the specific home, and the specific health concerns of the occupants. Understanding each method — its strengths, limitations, and appropriate applications — is what allows an inspector to build that combination intelligently.
Technique 1: Visual Inspection — The Essential Foundation
What it is: A systematic, methodical examination of the home using the inspector’s eyes, professional knowledge, and specialized tools including moisture meters, thermal imaging cameras, and borescopes.
What it finds: Visible mold growth, water stains indicating past moisture events, active moisture sources, condensation patterns, building failures that create mold-conducive conditions, and areas of elevated moisture even where no visible mold is yet present.
What it cannot find: Mold hidden inside wall cavities, inside HVAC ductwork, under flooring, or in any area that is not directly accessible to visual examination. Visual inspection also cannot determine mold species or quantify spore concentrations in the air.
What a Thorough Visual Inspection Covers
A professional visual inspection is far more than a walk-through with a flashlight. A competent inspector examines:
- All accessible attic and crawl space areas for signs of moisture intrusion, ventilation failures, and active mold growth on structural members
- HVAC system components including the air handler, coil, drain pan, and accessible ductwork
- All plumbing penetrations, under-sink cabinets, and areas around toilets, showers, and tubs
- Window frames and sills for condensation-related mold in climate-controlled spaces
- Exterior grading and drainage patterns that may be directing water toward the foundation
- Roof condition and any areas where roof penetrations may allow water intrusion
- The building envelope for signs of moisture migration through walls
- Any areas reported by occupants as sources of musty odor or past water events
The Moisture Meter: Making Invisible Problems Visible
One of the most important tools in a visual inspection is the moisture meter. While the inspector’s eyes can see visible mold and water staining, a moisture meter detects elevated moisture content inside building materials — drywall, wood framing, subfloor — before mold becomes visible. Mold requires approximately 48 to 72 hours of sustained moisture above 60% relative humidity to begin growing. A moisture meter reading above 20% in drywall or wood indicates conditions where mold is either already growing or will begin growing soon.
This capability transforms visual inspection from a reactive tool (finding existing mold) into a predictive one (finding conditions that will produce mold). Areas with elevated moisture readings that show no visible mold yet may be the most important finding of an inspection — catching the problem before it becomes expensive.
Thermal Imaging: Seeing Through Walls
Infrared thermal imaging cameras detect temperature differences in building surfaces that indicate hidden moisture. When moisture is present inside a wall cavity or behind flooring, it evaporates more slowly than the surrounding dry material, creating a temperature differential that appears on a thermal image as a cool spot. This allows an inspector to identify areas of hidden moisture intrusion — and therefore potential hidden mold growth — without opening walls.
Thermal imaging is a screening tool, not a diagnostic one: it identifies areas of suspected moisture that warrant further investigation, not confirmed mold locations. But in a Los Angeles home where water intrusion from roof leaks, plumbing failures, or condensation inside well-sealed walls may be entirely invisible from the surface, thermal imaging dramatically expands what a visual inspection can find.
When visual inspection alone is sufficient: In a small number of cases — typically when mold growth is clearly visible, limited to a small area, on a non-porous surface, and the moisture source has been definitively identified and corrected — visual inspection combined with moisture assessment may be all that is needed to guide remediation. In most residential situations, however, visual inspection is the beginning of the assessment process, not the end.
Technique 2: Air Sampling — The Gold Standard for Quantifying Airborne Exposure
What it is: Collection of air samples from the indoor environment using specialized pumps and collection media, followed by laboratory analysis to identify and count mold spores present in the air.
What it finds: The types and concentrations of mold spores present in the air at the time of sampling. Provides quantified data (spores per cubic meter) that can be compared against outdoor baseline levels and interpreted for health impact.
What it cannot find: The source or location of mold growth. An air sample tells you what is in the air — not where it came from. Air sampling also represents a snapshot in time; spore concentrations fluctuate based on HVAC activity, occupant movement, and time since last disturbance.
The Two Primary Air Sampling Methods
Spore Trap Sampling (Anderson Impactor / RCS Centrifugal Sampler)
The most common residential air sampling method. A calibrated pump draws a precise volume of air through a collection cassette containing a sticky surface that captures spores. The cassette is sent to a laboratory where a technician examines it under a microscope and counts spores by genus and type.
Results are expressed as spores per cubic meter of air for each identified genus: Cladosporium (common, typically outdoor-sourced), Aspergillus/Penicillium (common indoor indicator genera), Stachybotrys (the “black mold,” serious health concern), Chaetomium (associated with water-damaged drywall), and many others.
The critical comparison: every indoor air sample must be paired with an outdoor control sample taken at the same time. Indoor mold types and concentrations are always interpreted relative to what is outdoors. If outdoor air contains 5,000 Cladosporium spores per cubic meter and indoor air contains 4,800, that is a normal finding. If indoor air contains 3,000 Aspergillus/Penicillium spores per cubic meter and outdoor air contains 200, that is a significant abnormal finding indicating an indoor source.
Culture-Based Air Sampling (Andersen N-6 / RCS)
Culture-based sampling collects air onto a growth medium (agar plate) rather than a sticky trap. The plate is incubated in the laboratory, allowing viable (living) spores to germinate and grow into colonies that can be identified by species rather than just genus.
The advantage: species-level identification. The disadvantage: only viable (living) spores grow, so dead spores — which still cause allergic reactions — are not counted. Culture sampling also takes 7 to 14 days for incubation versus 24 to 48 hours for spore trap analysis.
When to use culture sampling: When the inspector needs species-level identification for medical reasons (a household member’s physician has requested specific species data for treatment decisions) or when legal proceedings require the most detailed possible characterization of contamination.
Why Multiple Air Samples Are Always Better Than One
A single air sample from one room in a multi-room home provides very limited information. Air spore concentrations vary significantly from room to room based on HVAC airflow patterns, proximity to the mold source, and whether HVAC was running during sampling. Professional residential air sampling typically includes:
- Samples from each major living area (living room, kitchen, primary bedroom)
- A sample from any room where occupants have reported symptoms or suspect mold
- A sample from the HVAC return air plenum (captures what the system is distributing throughout the home)
- An outdoor control sample taken simultaneously
- In larger homes or homes with HVAC zoning, samples from each zone
This sampling strategy allows the inspector to map contamination patterns across the home, identify which areas are most affected, and determine whether the HVAC system is distributing spores beyond the room of origin.
The HVAC Air Sample: Often the Most Important Sample in the Home
If your HVAC system has mold in the air handler, on the evaporator coil, or in the ductwork, it is functioning as a distribution network — moving spores from the point of growth into every room in the home simultaneously, 365 days a year. Sampling at the HVAC return captures what the system is pulling in and can reveal contamination that does not appear elevated in any individual room because it is uniformly distributed throughout the home.
In Los Angeles, where HVAC systems run year-round and many older homes have systems that have not been cleaned in years, HVAC air sampling is one of the highest-value diagnostic steps an inspector can take.
Technique 3: Surface Sampling — Tape Lifts, Swabs, and Bulk Samples
Surface sampling collects physical material from a suspect surface for laboratory analysis. There are three primary methods, each suited to different situations.
Tape Lift Sampling
What it is: A piece of clear tape is pressed firmly against a suspect surface and then lifted, adhering a sample of whatever is on that surface. The tape is placed on a glass microscope slide and sent to the laboratory for microscopic examination.
Best for: Sampling visible mold growth on smooth surfaces — drywall, painted walls, window frames, bathroom tile, wood. Tape lifts are excellent at capturing the morphological structure of mold colonies, which helps with identification.
Limitation: Only samples the visible surface layer. If mold has penetrated into a porous material like drywall or wood, tape lift captures what is on top but not what is inside the material.
What the lab reports: Genus and relative density of mold present, plus any other particles captured (skin cells, debris, insulation fibers that might indicate building material disturbance).
Swab Sampling
What it is: A sterile swab (similar to a cotton swab) is rubbed across a defined area of a suspect surface, collecting material. The swab is sent to the laboratory for either direct microscopic examination or culture analysis.
Best for: Sampling irregular or textured surfaces where tape lifts cannot make consistent contact — grout lines, rough concrete, textured ceiling finishes, HVAC vents and grilles. Swabs also work well when the inspector wants the option of both microscopic identification and culture-based viability assessment from the same sample.
Limitation: Swab samples cover a relatively small area and the collection efficiency varies based on technique and surface texture. Like tape lifts, swabs only capture what is accessible on the surface.
What the lab reports: Mold genera present and, for culture swabs, which species are viable (living).
Bulk Sampling
What it is: A physical piece of building material is collected — a small section of drywall, a piece of carpet, a chunk of insulation, a wood chip — and sent to the laboratory for analysis.
Best for: Situations where mold contamination of a material needs to be confirmed when surface appearance is ambiguous, where the inspector needs to know if contamination has penetrated into the material itself (not just on the surface), or where the material will be included in legal or insurance documentation.
When bulk sampling is particularly valuable: When a homeowner or property manager disputes whether a material needs to be removed during remediation. A bulk sample of the drywall or wood in question can confirm whether mold has penetrated the material’s structure (requiring removal and replacement) or is only on the surface (potentially treatable with surface remediation).
Limitation: Collecting a bulk sample requires cutting or removing a piece of building material, which is a minor intrusive procedure. It also only characterizes one specific location — it cannot tell you about the extent of contamination beyond the sampled point.
The Critical Limitation of All Surface Sampling
Surface sampling — regardless of whether it is tape lift, swab, or bulk — addresses only the specific location sampled. It confirms mold presence and identifies genus or species at that point. It does not tell you:
- The total area of contamination
- Whether the contamination has spread to adjacent areas not visually apparent
- The concentration of spores in the room’s air
- Whether occupants are being exposed to elevated airborne levels
This is why surface sampling is most powerful when combined with air sampling rather than used as a standalone technique.
Technique 4: ERMI Testing (Environmental Relative Moldiness Index)
What it is: A DNA-based testing method developed by the EPA that analyzes settled dust samples (collected by vacuuming a defined area of carpet or flooring) for the DNA of 36 specific mold species, producing a numerical score (the ERMI value) that indicates the relative moldiness of a home compared to a national reference database.
What makes ERMI different from other methods: ERMI uses quantitative PCR (polymerase chain reaction) — the same DNA amplification technology used in forensic analysis — to detect and quantify mold DNA. This means it can identify mold at the species level (not just genus) and detect species that are not visible or airborne at the time of sampling because they are present in settled dust that has accumulated over time.
The ERMI score: Calculated by subtracting the sum of DNA from 13 common outdoor mold species (Group 2) from the sum of 23 water-damage-associated indoor mold species (Group 1). Higher scores indicate greater water-damage-associated mold presence relative to background outdoor species.
Strengths of ERMI:
- Species-level identification without the waiting period of culture methods
- Detects a historical record of mold presence — dust accumulates over weeks and months, so ERMI captures past contamination events even if conditions have since dried out
- Particularly sensitive for detecting Stachybotrys chartarum (black mold) and other water-damage indicator species that may not be present in air samples if conditions have changed
- Useful for research contexts and for assessing homes with a complex moisture history
Limitations of ERMI:
- Does not indicate current conditions — it reflects historical dust accumulation, not present-day air quality
- Cannot identify the location of the mold source
- The national reference database may not reflect Southern California’s outdoor mold environment, potentially affecting score interpretation for LA homes
- Not yet universally accepted as a clinical diagnostic tool, though research on its health correlation continues
When ERMI is most useful: Post-remediation verification in homes where previous contamination was documented; research-oriented assessments; situations where the occupant’s health history suggests significant past mold exposure that may no longer be producing elevated air samples; legal and insurance contexts where comprehensive documentation is required.
Technique 5: HERTSMI-2 Testing
What it is: A simplified subset of ERMI that uses DNA analysis to quantify only five specific mold species that have the strongest association with health effects in susceptible individuals: Stachybotrys chartarum, Wallemia sebi, Aspergillus penicillioides, Aspergillus versicolor, and Chaetomium globosum.
Why it exists: HERTSMI-2 was developed specifically for use in the context of Chronic Inflammatory Response Syndrome (CIRS) — a condition affecting individuals with certain genetic variants who are unable to clear mold biotoxins effectively. For patients being treated for CIRS or biotoxin-related illness, physicians often require HERTSMI-2 testing to confirm that a home is safe for a recovering patient to occupy.
The HERTSMI-2 score: Each of the five species is scored based on its DNA concentration, and scores are weighted by the relative health impact of each species. A total score below 11 is generally considered acceptable for CIRS-susceptible individuals; scores above 15 indicate the home is not safe for occupancy by susceptible individuals without remediation.
When HERTSMI-2 is appropriate: When a household member has been diagnosed with CIRS or biotoxin-related illness by a physician; when a patient is returning home after treatment and needs confirmation the environment is safe; when a CIRS patient is evaluating a new home to purchase or rent; as a follow-up to ERMI testing that produced a concerning score.
Technique 6: Intrusive Investigation — Opening the Building Envelope
What it is: Physical removal or opening of building materials — cutting into drywall, lifting flooring, opening ceiling tiles, removing wall sections — to directly access concealed spaces and visually inspect or sample hidden mold growth.
When it becomes necessary: When all non-intrusive methods point strongly toward hidden mold contamination (elevated air samples, thermal imaging hot spots, persistent musty odors without visible source, occupant symptoms that are inconsistent with the level of visible contamination found) but the source cannot be confirmed without direct access.
Who performs it: In a proper assessment protocol, a mold inspector determines where intrusive investigation is warranted based on non-intrusive findings, and either performs limited opening themselves or coordinates with a remediation contractor. In a proper workflow, the inspector and the remediator are separate parties — the inspector’s job is to find and characterize the problem, not to fix it.
The borescope: minimally intrusive access A borescope (a flexible fiber-optic camera on a thin cable) allows an inspector to drill a small hole in drywall and insert the camera to examine the wall cavity interior without major demolition. If visible mold is found on the framing or back of drywall in the cavity, a targeted small opening can confirm it. If the borescope shows no contamination, the hole can be plugged with minimal repair needed.
Documentation during intrusive investigation: Any mold found during opening must be documented photographically before any material is disturbed. Sample collection (tape lift or bulk) from newly exposed contamination should be performed before remediation begins to document the contamination for insurance, legal, or medical records.
Technique 7: Post-Remediation Verification Testing
What it is: Mold testing performed after remediation work is complete to confirm that the work was effective and that the home is safe for occupancy.
Why it is non-negotiable: Remediation without verification is incomplete. A remediation company that tells you testing is unnecessary after their work is either cutting corners or has a conflict of interest. Post-remediation verification should always be performed by a third-party inspector who was not involved in the remediation work — not by the remediation contractor themselves.
What post-remediation verification includes:
- Air sampling in all areas that were remediated and adjacent areas where spores may have spread
- Visual inspection of remediated areas (with clearance criteria: no visible mold, no water staining, no musty odor)
- Surface sampling of remediated surfaces where contamination was previously documented
- Outdoor control air sample for comparison
- In some cases, ERMI or HERTSMI-2 testing for comprehensive clearance documentation
Clearance criteria: Post-remediation air samples should show indoor spore concentrations at or below outdoor levels, with no elevation of water-damage indicator genera (Aspergillus/Penicillium, Stachybotrys, Chaetomium) relative to outdoor baseline. If post-remediation samples show persistent elevation, additional remediation is required before clearance can be granted.
How to Choose the Right Mold Testing Approach: A Decision Framework
The right testing approach depends on the specific situation. Here is a practical framework:
Situation 1: Visible mold growth, known moisture source, small area (under 10 square feet)
Recommended: Visual inspection + surface sample (tape lift or swab) to identify species + moisture assessment to confirm source. Air sampling optional but recommended if HVAC may have distributed spores.
Situation 2: Musty odor but no visible mold
Recommended: Visual inspection with moisture meter and thermal imaging + comprehensive air sampling (multiple rooms + HVAC return) + surface sampling of any suspicious areas identified by thermal imaging. If air samples are elevated, intrusive investigation of areas identified by thermal imaging.
Situation 3: After a water event (flooding, roof leak, plumbing failure)
Recommended: Immediate visual inspection and moisture mapping + air sampling within 72 hours if materials have not dried + follow-up inspection at 5 to 7 days to assess whether materials dried successfully or mold has begun growing. Do not wait for visible mold to appear.
Situation 4: Occupant health symptoms (respiratory, neurological, fatigue) without clear visible cause
Recommended: Comprehensive air sampling + ERMI or HERTSMI-2 (particularly if CIRS is suspected by a physician) + thorough visual inspection with thermal imaging. Coordinate with the occupant’s physician regarding which specific species data is needed.
Situation 5: Pre-purchase home inspection with mold concerns
Recommended: Visual inspection + air sampling in areas of concern (attic, basement, crawl space, HVAC system) + moisture mapping of suspect areas. A mold contingency in the purchase contract allows time for full assessment before commitment.
Situation 6: Post-remediation verification
Recommended: Air sampling in all remediated areas and adjacent spaces + surface sampling of previously contaminated surfaces + outdoor control + visual clearance inspection. Performed by a third-party inspector, not the remediation contractor.
Mold Species That Testing Can Identify: Why It Matters
Not all mold is equally concerning. Understanding which species are detected by testing helps interpret the significance of findings:
Cladosporium — The most common airborne mold worldwide. Primarily outdoor-sourced. Finding it indoors at levels similar to or lower than outdoor concentrations is normal. Elevated indoor levels relative to outdoor can indicate an indoor source but this genus is less concerning than water-damage indicators.
Aspergillus/Penicillium — These two genera look similar under a microscope and are often reported together. While some species exist outdoors, indoor elevation of this group is a significant indicator of an indoor moisture problem. Certain Aspergillus species produce mycotoxins; Aspergillus fumigatus is a serious pathogen for immunocompromised individuals.
Stachybotrys chartarum — The notorious “black mold.” A slow-growing, water-loving species that requires sustained very high moisture (above 90% RH) to grow on cellulose materials. It is not found in outdoor air and its presence in indoor samples is always abnormal. Associated with mycotoxin production; serious health concern particularly for children and immunocompromised individuals. Finding even low counts of Stachybotrys in air samples is significant.
Chaetomium — Associated almost exclusively with water-damaged cellulose (drywall paper, cardboard). Its presence in indoor air samples is a reliable indicator of active or past water-damaged drywall. Commonly found alongside Stachybotrys in severely water-damaged homes.
Wallemia sebi — A xerophilic (dry-condition) mold that grows in lower humidity than most species. Associated with dust and stored materials. One of the five species included in HERTSMI-2 due to its association with health effects in biotoxin-susceptible individuals.
Alternaria — Common allergen-producing mold associated with outdoor environments and bathrooms. Frequently elevated in homes with poor bathroom ventilation or shower mold. Important allergen for asthma sufferers.
Why Los Angeles Homes Present Unique Mold Testing Challenges
Los Angeles creates a distinctive set of conditions that affect how mold testing should be approached:
The outdoor mold baseline problem: LA’s Mediterranean climate produces high seasonal outdoor mold spore counts — particularly Cladosporium and Alternaria during dry summer months and following rain events in winter. This means interpreting indoor-versus-outdoor air sample comparisons requires a Los Angeles-calibrated understanding of what is normal outdoors at different times of year, not just national baseline data.
Post-wildfire mold: LA’s increasingly severe wildfire seasons create a specific mold risk that most mold testing guides ignore. Firefighting water intrusion — particularly from aerial drops and structure protection hose-downs — saturates building materials that may not dry adequately before the fire season is over and cooler, more humid winter conditions arrive. Post-fire mold in LA can develop inside walls that appear structurally intact but were penetrated by firefighting water. Thermal imaging is particularly valuable in post-fire assessments.
Apartment and multi-unit buildings: LA’s dense urban housing stock means that a significant portion of residents live in buildings where their unit shares walls, ceilings, and plumbing systems with neighbors. Mold from a neighbor’s unit can intrude through shared walls; plumbing leaks in upper units affect lower ones. Air sampling in multi-unit buildings requires understanding of how contamination travels between units through shared air pathways.
Coastal humidity: Properties within a mile or two of the coast — Santa Monica, Venice, Manhattan Beach, Marina del Rey, Malibu — experience persistent marine layer humidity that keeps building materials at elevated moisture content. This creates a background condition where even small moisture events from plumbing or roof issues can trigger mold growth more quickly than in drier inland areas.
Title 24 sealed construction: Energy-efficient construction that minimizes air exchange can trap elevated mold spores from minor sources at concentrations that would self-dilute in less tightly sealed buildings.
Why Los Angeles Homeowners Choose The Mold Inspection Canary
At The Mold Inspection Canary, we understand that mold testing is not a single procedure — it is a diagnostic process that requires selecting the right combination of techniques for each specific home, each specific problem, and each specific family’s health situation.
Our certified inspectors bring a methodical, evidence-based approach to every inspection:
- We begin every assessment with a thorough visual inspection using professional-grade moisture meters and thermal imaging cameras — because finding the source is as important as confirming the contamination
- We design air sampling strategies specific to your home’s layout, HVAC configuration, and the areas of concern — not a one-size-fits-all approach
- We always collect outdoor control samples simultaneously with indoor samples, because indoor air data is meaningless without the outdoor baseline comparison
- We offer surface sampling — tape lifts, swabs, and bulk samples — when targeted species identification or localized confirmation is needed to direct remediation
- We provide ERMI and HERTSMI-2 testing for clients with complex health histories or specific physician requirements
- We perform post-remediation verification testing as an independent third party — we never perform remediation ourselves, so our clearance testing is always impartial
- We are experienced with Los Angeles’s specific mold challenges: coastal humidity, post-wildfire assessment, multi-unit building dynamics, and the outdoor mold baseline of Southern California’s Mediterranean climate
- We deliver written reports that explain every finding in plain language — what was found, what it means for your family’s health, and exactly what should be done next
We serve homeowners, renters, property managers, and real estate buyers throughout greater Los Angeles — Santa Monica, Beverly Hills, Manhattan Beach, Malibu, Marina del Rey, Pasadena, Burbank, Glendale, and surrounding communities. Same-week appointments are available, and written results are delivered within 24 hours of laboratory analysis.
Concerned about mold in your Los Angeles home?
Call or Text: 310-567-1160
Book a professional mold testing appointment in Los Angeles to receive a comprehensive inspection, laboratory analysis, and a detailed report explaining exactly what was found.
Frequently Asked Questions
Q: What is the difference between mold testing and a mold inspection — and do I need both?
A: An inspection looks for moisture problems and visible growth, while testing collects and analyzes lab samples. You need both. An inspection without testing can miss hidden toxic spores, and testing without an inspection gives you raw numbers without the context needed to find the source.
Q: Is air sampling or surface sampling more important — and which one should I ask for?
A: They serve different purposes. Air sampling is vital if you want to know what your family is breathing or suspect hidden mold behind walls. Surface sampling is best when you see visible growth or stains and need to identify the exact type. A comprehensive assessment usually combines both.
Q: How long does mold testing take, and how quickly will I get results?
A: The on-site visit takes 2 to 4 hours. Standard air and surface lab results are usually ready within 24 to 48 hours, though specialized DNA or culture tests can take 5 to 14 days. At The Mold Inspection Canary, your final written report is delivered within 24 hours of receiving the lab data.
Q: Can I test for mold myself with a kit from the hardware store?
A: No, DIY kits are largely a waste of money. They simply confirm that mold spores exist—which is true for every home. They cannot measure exact concentrations, provide an outdoor baseline comparison, or identify dangerous species. They frequently produce false positives and negatives, making them unreliable for health decisions.
Q: My home was remediated for mold last year. Do I need to test again?
A: Only if you have a new leak, notice a musty odor, or experience returning health symptoms. However, if you never had a third-party clearance test when the work was completed—or if the remediation company tested their own work—independent testing is strongly recommended to verify the job was done right.
Q: Are some types of mold more dangerous than others, and does the testing tell me which type I have?
A: Yes. Toxic strains like Stachybotrys (black mold) are far more dangerous than common outdoor molds. Standard lab testing identifies mold down to the genus level, which is plenty of detail for most health assessments. If a doctor requires specific species-level data for medical treatment, advanced DNA testing can be used.
