Urine mycotoxin panel (mould/mycotoxin testing)

ND-recommended test reviewed: urine mycotoxin panel.
Indications reviewed: suspected mold-related illness/biotoxin illness/CIRS; no validated indication identified.
Not ordered. Rationale discussed: no FDA-approved test or validated reference range exists; mycotoxins occur in healthy people's urine from dietary sources; unvalidated testing has led to documented harm. Ref: CDC MMWR 2015.
Patient informed test available privately via ND. Patient given info page: https://labs.ajaxharwoodclinic.com/mycotoxin-urine/patient
Revisit if: objective signs of a water-damaged building are found (visible mould, musty odour, past flooding), in which case building inspection and remediation, not urine testing, is the next step.

Indicated when

None recorded.

Not indicated when

• —Diagnosing 'mold illness,' 'biotoxin illness,' or chronic inflammatory response syndrome attributed to building mould exposure: no validated urine mycotoxin test or disease-predictive reference range exists for this purpose [1]
• —Guiding antifungal treatment, dietary restriction, or other interventions for symptoms attributed to mould exposure based on a urine mycotoxin result [1]

Why not

There is no FDA-approved test for mycotoxins in human urine, and no established, validated urine mycotoxin level predicts disease [1]. Mycotoxins occur in the urine of healthy people from ordinary dietary sources, since low levels of mycotoxins are present in many foods, so a 'positive' result does not distinguish illness from background dietary exposure. The CDC has documented concrete harm from acting on these results: in one investigated case, a positive urine mycotoxin test led to a diagnosis of 'mold toxicity,' a prescribed antifungal medication (which treats fungal infection, not toxin exposure), several nonstandard treatments, and over $25,000 in destructive building testing that ultimately found no evidence of water damage or significant fungal growth [1]. CDC does not recommend biologic testing of people who work or live in water-damaged buildings.

Better first step

For suspected building-related mould exposure, start with a visual inspection for water damage or visible mould rather than a urine test. Evaluate and manage the patient's symptoms on their own merits, since there is often a real, treatable driver (a respiratory or allergic condition, poor sleep, or another cause of fatigue) rather than anchoring the work-up on a mycotoxin panel.

Typical ND rationale

An ND may order a urine mycotoxin panel reasoning that a patient with fatigue, brain fog, or respiratory symptoms and a known or suspected damp building, at home or at work, has been exposed to mould toxins that a urine test can detect and quantify.

Ontario coverage & CONO orderability

OHIP status

uninsured

This is not part of the OHIP-funded community laboratory system. These are proprietary tests processed by US reference laboratories (for example, RealTime Labs, or Mosaic Diagnostics/Great Plains) and sold directly to patients or through clinics; it is patient-paid regardless of who orders it, and was not found named in the 2026 Schedule of Benefits for Laboratory Services.

CONO orderable

No

Not found on the CONO list after reviewing all 196 items; not a naturopath-orderable test under the CONO scope-of-practice regulation. It is nonetheless offered directly to patients by at least one Ontario clinic found this session (Markham Integrative Medicine, via RealTime Labs), and by US laboratories (Mosaic Diagnostics/Great Plains, RealTime Labs) that ship kits to Canadian patients.

Linked conditions

• "Mould illness" / "CIRS" (chronic inflammatory response syndrome) ↗
• tired ↗

Counselling script

“There's no approved or validated way to use a urine mycotoxin test to diagnose mould-related illness, and these toxins actually show up in healthy people too, mostly from food. I wouldn't order this test. If you're concerned about a damp building, the better step is having it visually inspected, and let's look carefully at what might really be causing your symptoms.”

Revisit if

• —Objective signs of a water-damaged building are found (visible mould, musty odour, history of flooding)
• —Respiratory or allergic symptoms suggest a mould-sensitization work-up is warranted

References

1. [1]US Centers for Disease Control and Prevention (MMWR) (2015). Notes from the Field: Use of Unvalidated Urine Mycotoxin Tests for the Clinical Diagnosis of Illness — United States, 2014. linkNo FDA-approved urine mycotoxin test exists; no validated disease-predictive levels established; mycotoxins found in healthy people's urine from diet; CDC does not recommend biologic testing of people in water-damaged buildings; documented case of harm from acting on a result
2. [2]Markham Integrative Medicine (Ontario) (2026). Mycotoxin Testing – Markham Integrative Medicine. linkConfirms urine mycotoxin testing (RealTime Labs) is marketed directly to patients by an Ontario clinic