Testing for mycotoxins falls into two categories: testing your body for signs of exposure, and testing your environment for the mold that produces these toxins. Both options are commercially available, but they come with important caveats about accuracy and interpretation. There is no FDA-approved test for mycotoxins in human urine, and the major allergy and immunology organizations caution that most commercial tests lack standardization and don’t have established thresholds for what constitutes a harmful level.
That said, if you suspect mold exposure is making you sick, here’s what each testing method actually involves, what it costs, and how much weight to give the results.
Urine Mycotoxin Panels
The most widely marketed test is a urine panel that measures concentrations of specific mycotoxins like ochratoxin, trichothecenes, and aflatoxins. Commercial labs such as RealTime Laboratories and US BioTek offer panels for around $399 out of pocket, and most health insurance plans do not cover them. You collect a first-morning urine sample at home and mail it to the lab.
The core problem with these panels is context. Low levels of mycotoxins show up in the urine of perfectly healthy people because mycotoxins are naturally present in many common foods, including grains, coffee, dried fruits, and wine. A study of healthy adults in Italy found that 97% had detectable levels of ochratoxin in their blood, with most falling between 0.2 and 1.0 ng/ml. So a “positive” result doesn’t necessarily mean you have a dangerous exposure. The CDC has noted that mycotoxin levels that predict disease have not been established, and the American Academy of Allergy, Asthma & Immunology warns these tests can produce both false positives and false negatives.
Some practitioners recommend a “provocation protocol” before testing, intended to release stored mycotoxins into the urine and produce a more accurate reading. A typical protocol involves taking 500 mg of liposomal glutathione twice daily for five days, using a sauna or hot Epsom salt bath the evening before collection, then collecting the first morning urine. However, US BioTek states their test is fully validated on random urine without provocation. Whether to provoke is a clinical decision, and half-measures (moderate glutathione or a quick sauna right before collection) don’t meaningfully change results.
Blood Tests and Immune Markers
Rather than measuring mycotoxins directly, some clinicians look for immune markers that suggest your body has reacted to mold. These include mold-specific IgG and IgA antibodies measured through a blood draw, and IgE antibodies assessed through skin-prick allergy testing. IgG antibodies directed at molds can be useful indicators of exposure, and they’re a standard part of evaluating conditions like hypersensitivity pneumonitis (a type of lung inflammation caused by inhaling organic particles) and allergic bronchopulmonary aspergillosis.
The limitation here is that antibody levels don’t reliably correlate with symptoms. One study evaluating patients with mold-related health complaints found that while 37% had abnormalities on clinical examination, their immune responses were not statistically different from people without symptoms. In other words, your immune system may show evidence of mold exposure without that exposure being the cause of how you feel.
Visual Contrast Sensitivity Screening
Visual Contrast Sensitivity (VCS) testing is an inexpensive screening tool you can take online in a few minutes. It measures your ability to distinguish between shades of gray at different spatial frequencies, a neurological function that biotoxins can impair. Your corrected vision needs to be better than 20/50 for the test to be valid.
The test produces a simple pass or fail. A failed result doesn’t diagnose any specific condition, but when combined with symptoms affecting multiple body systems, a VCS deficit raises the likelihood of chronic inflammatory response syndrome to 98.5%, according to data collected from tens of thousands of tests. The overall accuracy rate is reported at 92%. It’s best understood as a quick, low-cost first step rather than a definitive answer. You can fail for reasons unrelated to mold, and about 8% of people with biotoxin illness pass it.
Environmental Dust Testing (ERMI and HERTSMI-2)
If you want to know whether your home or workplace has a mold problem, environmental testing can be more informative than body testing. The gold standard for residential mold assessment uses a DNA-based method called mold-specific quantitative PCR, which identifies mold species from a dust sample collected with a Swiffer-type cloth or vacuum cassette.
Two scoring systems use this technology. ERMI (Environmental Relative Moldiness Index) analyzes 36 mold species and produces a single score. Scores above 30 are considered problematic. HERTSMI-2 is a streamlined version that focuses on five of the most concerning water-damage molds. Any HERTSMI-2 score over 10 suggests a problem, and moldy buildings routinely score above 16.
DNA-based testing is significantly more sensitive than traditional methods. Conventional approaches involve either collecting airborne spores on a sticky surface for microscopic identification, or culturing mold on growth media. Both methods miss a lot. Spore traps are limited because many mold species look identical under a microscope, and culture-based methods can’t detect dead mold or fragments of mold that are no longer viable but still release mycotoxins. Culturing has been shown to underestimate concentrations of certain mold species by 100 to 1,000 times compared to DNA-based methods. Traditional microscopy also can’t distinguish among the hundreds to thousands of fungal species that may be present in a single sample.
What Testing Strategy Makes Sense
For most people concerned about mold exposure, starting with environmental testing gives you the most actionable information. If your ERMI or HERTSMI-2 scores indicate a mold problem, you know what needs to change: remediation or relocation. That information is concrete and directly useful regardless of what a urine panel might show.
If you’re experiencing symptoms and want documentation for a healthcare provider, a combination of environmental testing plus immune markers (mold-specific IgG/IgA and allergy testing) provides more clinically accepted evidence than a urine mycotoxin panel alone. The VCS test is worth taking simply because it’s fast and cheap, and a failed result gives your provider one more data point.
Urine mycotoxin panels remain controversial. They can sometimes help identify which specific mycotoxins are elevated, which in turn can guide a practitioner toward the type of mold involved. But the lack of FDA approval, the absence of established disease-predicting thresholds, and the fact that healthy people routinely test positive all mean these results need careful interpretation. A “positive” urine mycotoxin test by itself does not confirm that mold is causing your symptoms, and a negative result does not rule it out.