Reviewed by the Nampa Mold Experts inspection teamUpdated How we write and check these pages
Short answer: air samples compare indoor spores with outdoors; tape lifts and swabs identify a visible growth; wall-cavity samples check inside a wall; bulk samples test a piece of material; ERMI and HERTSMI-2 analyze settled dust by DNA for longer-term questions. Start with the question, then pick the test.
Mold tests at a glance
| Test | What it answers | Limits |
|---|---|---|
| Spore trap air sample | Are indoor airborne spores higher or different from outdoors right now? | A snapshot; can miss mold sealed in walls; needs an outdoor control |
| Tape lift | Is this stain mold, and what kind? | Only tells you about that spot |
| Swab | Same as a tape lift, for rough or uneven surfaces | Only that spot |
| Bulk sample | Is this material (insulation, drywall) contaminated? | Destructive; only that piece |
| Wall-cavity air sample | Is there elevated mold inside this wall? | Needs a small hole; one cavity at a time |
| ERMI / HERTSMI-2 | What mold DNA has built up in settled dust over time? | Not a standard for diagnosing a building; scores need context |
| Culturable (viable) sample | Which species will grow in a lab? | Slower; misses dead spores that can still trigger allergies |
Spore trap air samples
A calibrated pump pulls a measured volume of air through a small cassette with a sticky slide. A lab examines the slide under a microscope, identifies spore types and counts them, usually following ASTM D7391. The result is spores per cubic meter of air. On its own, that number means little. Compared with an outdoor sample taken the same day, it shows whether there's likely an indoor source. See air quality testing and what's a normal spore count?
Tape lifts and swabs
When there's a visible growth and you want to know whether it's mold and what type, a tape lift or swab is quick and inexpensive. It's useful for telling mold from dirt, soot or efflorescence, and for documenting water-damage molds such as Stachybotrys or Chaetomium. It doesn't tell you anything about the air. See surface mold testing.
ERMI and HERTSMI-2 dust tests
ERMI analyzes settled dust for DNA from 36 mold species and produces a score. HERTSMI-2 uses a smaller group of five water-damage-associated species. Some physicians ask patients for these tests. They reflect longer-term buildup rather than a single moment, but they aren't designed to locate a moisture problem, and results can be hard to interpret without an inspection. See ERMI and HERTSMI-2 testing.
Which test should you choose?
- Musty smell, nothing visible: inspection first, then air samples in suspect rooms plus outdoors, and wall-cavity samples if a wall reads wet.
- Visible growth, want to know what it is: tape lift or swab.
- Visible growth, cause obvious: often no test needed. Fix and clean.
- Buying a home: inspection with air samples and tape lifts on anything flagged.
- Doctor asked about your home: inspection plus whatever test your doctor requested, often ERMI or HERTSMI-2.
- After remediation: clearance testing with air samples and a visual check.
Most people asking about Mold Test Types in Nampa, ID actually need an inspection first. The test is a tool, not the answer.
Mold Test Types Nampa, ID: questions
Which mold test is most accurate?
None is "most accurate" in general. Each is accurate for its own question. An air test can't identify a stain; a tape lift can't tell you about the air.
Are DIY mold test kits reliable?
Settle plates almost always grow mold because spores are everywhere, so they rarely tell you anything useful. See DIY kits vs professional testing.
Do you test for mycotoxins?
Environmental mycotoxin tests exist, but interpretation is limited and contested. If your doctor requests one, we can discuss options. We usually start with an inspection.
Which tests do you use most?
Spore trap air samples with an outdoor control, tape lifts on visible growth, and moisture readings on every job. ERMI and HERTSMI-2 when a physician asks.
How much do Mold Test Types in Nampa, ID cost?
Air sampling is usually part of an inspection with air testing, typically $300–$650. Extra air or surface samples typically add $50–$150 each, and ERMI typically runs $300–$600. Your exact price is confirmed before the visit.
Can one test tell me if my house is safe?
No. No test can certify a home safe for every person. Testing helps answer specific questions about whether there's an indoor mold problem and where. For Mold Test Types Nampa, ID decisions, start with the question you need answered.
