Mold and Mycotoxin Testing: When Is It Worth It?

Your Guide To Mold Toxicity Test Options, and What To Do Before This

If you have been struggling with unexplained symptoms like fatigue, difficulty concentrating, or allergy-like symptoms, you may be wondering if mold and mycotoxin testing can help you find answers. 

Mycotoxin Testing: Testing kit on a table

Testing for mold or mycotoxins (toxins produced by mold and other fungi) may be helpful in some contexts, but it’s definitely not a recommended starting point in your health journey. Mycotoxin research is still in its infancy and testing is not well validated. Misinterpreting or putting too much weight on test results may distract from identifying other important health issues.

Before considering mycotoxin testing, it’s essential to explore other factors that may be responsible for your symptoms. Poor gut health is often the reason for unexplained, mysterious symptoms. 

In this article, we will break down all of the important points to consider before testing for mold or mycotoxins. Next, we will discuss the most common types of mold tests that are available, including the pros and cons for each and who they’re most suitable for.

First, let’s take a quick look at what mycotoxins are. 

What Are Mycotoxins?

Mycotoxin Testing: 3D illustration of fungi causing molds

Mycotoxins are certain toxins that are naturally produced by mold and other kinds of fungi. Humans may be exposed to mycotoxins through the air in mold-affected buildings or homes and through certain kinds of foods.

Mycotoxin exposure can lead to illness, the symptoms and severity of which vary significantly from person to person [1, 2].

Possible Symptoms of Mold Toxicity

  • Sinusitis or other sinus issues 
  • Shortness of breath, coughing, or wheezing 
  • Development or worsening of asthma or allergic reactions
  • Memory impairments or brain fog
  • Fatigue or chronic fatigue syndrome
  • Slurred speech or lack of coordination 
  • Dizziness or lightheadedness 

Who Should Consider Mold or Mycotoxin Testing?  

First, let’s distinguish between mold and mycotoxin testing.

Mold testing generally refers to environmental testing (for the presence of mold in a home or building), while mycotoxin testing refers to tests that look at the presence or effects of mycotoxins in the body. 

You might want to consider mycotoxin testing if:

  • You have already taken care of foundational health steps, including modifying diet and lifestyle and healing your gut, but you are still not feeling well; 
  • You are experiencing symptoms or health effects consistent with mold toxicity, and; 
  • You have access to an experienced, trusted, and rational practitioner who can help to interpret your results. 

Is Mycotoxin Testing Worth It?  

Mycotoxin testing can be helpful in some cases, but there are a number of points to consider before jumping in.

  • Mycotoxicity is not well defined. Research on mycotoxin testing is still in its infancy. This means that even those who study mycotoxins or mold for a living don’t know exactly how to interpret mycotoxin test results. This doesn’t necessarily mean that test results can’t be useful — they should always be taken with a grain of salt.
  • Choosing the best test is challenging. There are many different kinds of mycotoxin and mold tests available, using not only different methods but different reference ranges, and even looking at different kinds of mold species and mycotoxins. This makes an area that is already lacking in research even more confusing. 
  • Mold can be a red herring. Mold or mycotoxins may show up in small quantities on tests, even if the levels are likely not problematic. This can be a distraction from true underlying health issues that need to be addressed.
  • Mold-related illnesses are complex. Even as we begin to untangle the nuances in testing, there is a lack of consensus when it comes to the treatment of mold-related illnesses and mycotoxicity. In other words, mycotoxin testing might provide clues to treatments, but it does not provide a road map.

Ultimately, whether or not mycotoxin testing is worth it really depends on the case. But either way, it’s essential to keep the bigger picture in mind and to remember that mycotoxin testing is only one piece of the puzzle.

Mold and Mycotoxin Testing Options

Mycotoxin Testing: Woman holding test tubes with specimen

There are many different kinds of tests available, and they each have their own benefits and challenges.

Some tests look at levels of mold exposure or the burden of mycotoxins on the body, while others analyze how the immune system is reacting to mold and mycotoxins. 

Research on all mold and mycotoxin testing is limited, and there is no perfect test [3]. There are currently no FDA-approved laboratory tests for mycotoxins. 

Keep in mind that two people may have similar levels of exposure to toxins but very different capacities to detoxify from them.

When selecting a test, ideally with the help of a practitioner, consider your main question. Is it “Have I been exposed to mold?” or is it “How is my body handling a known mold exposure?”

Urine Mycotoxin Testing 

How it works: Urine mycotoxin testing is a broad category that includes several different tests from different labs. These tests measure levels of various different mycotoxins, which may include ochratoxin a, citrinin, aflatoxin b1, fumonisin, and zearalenone. Many of these mycotoxins are produced by the common mold species aspergillus. All urine mycotoxin tests measure the levels of mold metabolites that you are eliminating through a urine sample. Some also measure markers related to immune response.

Pros: Urine testing provides direct measurements of the toxins being excreted, and you use the test to check your levels throughout treatment. Some studies have found that, compared to healthy individuals, people who have been exposed to mold and have symptoms of toxicity show elevated mycotoxin levels in their urine [3, 4]. 

Cons: Certain factors, including diet, supplements, and chronic illness, may affect how many toxins you excrete in your urine. Additionally, some research reviews have suggested that the presence of mycotoxins in many common foods means that some people might be flagged on urine tests even if they are healthy [5 Trusted SourcePubMedGo to source, 6]. Finally, a urine mycotoxin analysis doesn’t necessarily help to determine whether mold is a current problem for your body or in your environment. That’s because you could be excreting mycotoxins from an older exposure.

Who it’s best for: Urine mycotoxin testing may be best if your symptoms are puzzling and frustrating but not severe and you have already taken the necessary steps to improve your diet and lifestyle. 

Serum (Blood) Mycotoxin Testing 

How it works: Blood tests for mycotoxins measure anti-mold antibodies, which have been shown to be elevated among people who have been exposed to mold [7 Trusted SourcePubMedGo to source].

Pros: Blood tests can tell you how your body is currently reacting to mycotoxins by measuring markers of immune system reactivity. 

Cons: Research is limited when it comes to the accuracy or relevance of serum mycotoxin testing. Serum testing also can’t show you how much you’re excreting or eliminating.

Who it’s best for: Blood testing may be best for those who are less likely to be able to excrete mycotoxins through urine. This may include those who are more severely ill or who have a hypersensitivity to food and supplements.

Visual Contrast Sensitivity Testing (VCS) 

How it works: Visual Contrast Sensitivity (VCS) testing aims to measure a component of neurological function that may be affected by exposure to mycotoxins and other biotoxins. This method looks at your ability to see details in varying contrasts of black, white, and grey on a computer screen.

Pros: VCS testing is inexpensive, fast, and simple. It can also be easily repeated throughout treatment. One study found that VCS scores were lower among employees of a school that had been exposed to water damage than employees at an unaffected school [8 Trusted SourcePubMedGo to source].   

Cons: VCS testing is limited in the sense that it can’t tell you how much mold you’ve been exposed to, how much you are excreting, or how exposure may be affecting other areas beyond neurological function. 

Who it’s best for: VCS testing may be best for those who suspect or know they’ve been exposed to mold or mycotoxins, have neurological symptoms, and are on a budget.  

Environmental Mold Testing

How it works: Do-it-yourself kits and inspection services are available to test for mold and other toxins in your home if you suspect that they may be problems. 

Pros: Environmental testing can help you to identify and measure the presence of mold in your home. Limited research has shown that the popular ERMI (Environmental Relative Moldiness Index) test can detect environmental mold that correlates with asthma [9 Trusted SourcePubMedGo to source, 10 Trusted SourcePubMedGo to source].

Cons: Of course, while environmental testing can tell you that there is a mold problem in your environment, it can’t tell you anything about how your body is reacting to that mold. Mold may also show up on environmental tests even when levels are likely not high enough to be harmful, which can lead to unnecessary panic. 

Who it’s best for: Environmental testing might be a good idea if you suspect that mold exposure is a current problem in your home and want to know the degree of the problem. Try to work with a general environmental testing service as opposed to a mold-specific service so that other possible environmental toxins are not overlooked.

Start With Diet, Lifestyle, and Gut Health

Paper bag full of fruits and vegetables

Sometimes, symptoms that are associated with mold illness might actually be caused by poor gut health or inflammation. Making changes to diet and lifestyle can resolve some or all symptoms, potentially eliminating the need for mycotoxin testing. 

It’s also easier to test for and treat mold toxicity if results are not confounded by gut health symptoms. Some important factors to consider are: 

Another reason to start with your diet and lifestyle is that these factors might actually influence your mycotoxin test results. Many mycotoxin tests work by measuring the toxins that your body is eliminating. However, if diet and lifestyle components are not in place, your body may be less capable of excreting toxins.

This can mean not only worse health and symptoms but also that testing may not reflect your body’s true ability to rid itself of mycotoxins. 

The Low Mold Diet

A low mold diet is sometimes recommended as a simple way to begin to heal from suspected mold illness. Low mold diets eliminate foods that feed fungal growth as well as those that may contain or be contaminated with mold. 

A low mold diet is fairly similar to a general anti-inflammatory diet, like the Paleo diet, which I often recommend to my patients. Many of the foods that are eliminated, like sugar and processed foods, should be avoided across the board. 

Things to avoid on a low mold diet include: 

  • Sugar 
  • Processed and refined foods 
  • Cheese 
  • Mushrooms 
  • Certain kinds of nuts including peanuts and cashews 
  • Wheat and rice 
  • Dried fruits 
  • Alcohol

Consider Gut Testing Before Mycotoxin Testing 

If diet, probiotics, and lifestyle factors alone are not enough to resolve your symptoms, the next step should be to look into whether you might have a gut health problem that requires a more specific treatment approach. 

Testing for imbalances or infections including small intestinal bacterial overgrowth (SIBO) or H. pylori can help to elucidate what’s specifically going on in your gut. 

Gut health imbalances, including SIBO or intestinal permeability (leaky gut), can lead to many of the symptoms and health concerns associated with mold toxicity [24 Trusted SourcePubMedGo to source, 26 Trusted SourcePubMedGo to source, 27, 28, 29 Trusted SourcePubMedGo to source]. For example: 

Gut imbalances are more common, better understood, and often more easily remedied than mold-related illnesses. By healing your gut, you may be able to avoid mycotoxin testing altogether and, more importantly, feel better. 

Mold Remediation 

Stressed woman looking at molds in the wall

If you already know that you have been exposed to toxic mold through your home or workplace, the first step is to deal with the source of the exposure to the best of your ability. 

Signs of mold growth may include visible mold, dampness, leaks, and stained or moldy ceiling tiles. Mold spores can also show up in air conditioning units and on drywall. Black mold (stachybotrys chartarum) is often thought to be the most toxic kind of environmental mold, but this is not necessarily the case. All visible mold should be addressed.

There are several steps that need to be taken in order to remove mold from a water-damaged building or home, including thorough drying, cleaning, and disinfecting. A mold remediation service can help with severe conditions.

For prevention, a dehumidifier can help to reduce moisture and improve indoor air quality, and regular cleaning and disinfecting of indoor environments can help to control mold growth. 

Consider Diet, Lifestyle, and Gut Health Before Mycotoxin Testing 

Mycotoxin testing may be useful in some cases, but there are a number of important points and factors to consider first. 

Modifying your diet and lifestyle, with an emphasis on improving your gut health, is the first step when it comes to improving any aspect of your health. Imbalances in the gut can lead to a number of symptoms that might be associated with mold toxicity. 

If you continue to have symptoms after completing these fundamental steps and suspect that mold exposure or toxicity may be behind your symptoms, testing can be considered. Keep in mind that mycotoxin or mold testing may be able to provide some helpful information, but that given the lack of research in this field, all results should be interpreted cautiously. 

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