Fungi in the body: self-test, search term, or finding - what a gut test really shows
The essentials at a glance
“Fungi in the body” is a search term, not a finding. There is no test that measures fungi throughout the entire body. Yeasts are single-celled fungi, and they are part of the gut flora in healthy adults: In 317 stool samples from healthy adults, Candida albicans was found in 80.8 percent of the samples (Nash et al., Microbiome, 2017).
Every fungus has its location and its own detection method. A gut test uses a stool sample and shows colonization with yeasts as a proportion of the flora. It says nothing about the skin and nothing about the vagina. A self-test without a laboratory, such as saliva in a glass of water, does not detect any fungus at all.
This article puts the search term into context, presents the figures from healthy stool samples, distinguishes between locations in the body, and explains what a gut test measures as a proportion - and what it does not measure. It concludes by explaining when it is time to see a doctor.
What to expect in this article
1. “Fungi in the body”: a search term, not a finding
2. Yeasts in the gut of healthy people: the figures
3. Where a fungus is located determines how it is detected
4. What a gut test measures about yeasts
5. Three misconceptions about detecting fungi
6. When it is time to see a doctor
7. What you can do now
Frequently asked questions
Sources
“Fungi in the body”: a search term, not a finding
Anyone who types “fungi in the body self-test” is looking for an explanation for symptoms such as fatigue or a bloated stomach. The term promises that all of these have a single cause and that this cause can be found at home. The term delivers on neither promise.
No laboratory tests “the body” for fungi. A sample is always taken from a specific location: stool from the gut, fluid from the vagina. For skin and nails, it is a skin scraping. Anyone who skips this step is looking for a result for which no testing method exists.
Key message
“Fungi in the body” is a search term, not a finding: Every fungus has its location, and every location has its own detection method.
Yeasts in the gut are the norm, not the exception
Yeasts are single-celled fungi. They live in the gut alongside bacteria and are part of the normal flora in healthy adults. The entirety of the fungi in a given location is called the mycobiome - the counterpart to the microbiome, meaning all the microorganisms living there, including bacteria.
This leads to a conclusion that shifts the entire search: Finding fungi in stool is not, by itself, a sign of illness. It shows that something is present that is also present in healthy adults. What makes this finding interesting is not its presence, but its proportion - how large a part of the flora is made up of yeasts.
This concerns detection, not symptoms. Which symptoms are associated with a fungus in the gut is explained elsewhere: Candida fungus in the gut: symptoms. Here, the question comes first - what can actually be measured and where the sample comes from.
Yeasts in the healthy human gut: the figures
The figures for fungi in the healthy gut come from an analysis of 317 stool samples from healthy adults in the Human Microbiome Project, a large collection of samples from healthy volunteers. Paraphrased from Nash et al., Microbiome, 2017: Fungal diversity was considerably lower than bacterial diversity, and yeasts dominated.
Three species stood out. Saccharomyces cerevisiae, the yeast that also makes bread rise, was found in 96.8 percent of the samples; Malassezia restricta, a type of yeast otherwise known from the skin, was found in 88.3 percent; and Candida albicans was found in 80.8 percent (Nash et al., Microbiome, 2017). Candida albicans is the type of yeast simply called “Candida” in everyday language.
Evidence-based figures
317
Stool samples from healthy adults were examined for fungi (Nash et al. 2017)
80,8 %
of the samples contained Candida albicans (Nash et al. 2017)
96,8 %
of the samples contained Saccharomyces cerevisiae (Nash et al. 2017)
up to 75 out of 100
Women experience vaginal yeast infections at least once in their lives (IQWiG 2026)
Source: Nash et al., Microbiome, 2017; gesundheitsinformation.de (IQWiG), 2026
Why a proportion is a status, not a verdict
The same study provides the second important observation. Paraphrased from Nash et al., Microbiome, 2017: The fungal community varied greatly between individuals and within the same individual; over time, a person's mycobiome was no more similar to itself than to that of another person. Over approximately one year, the three species were found in all samples provided by 92.2, 78.3, and 63.6 percent of the volunteers, respectively (Nash et al., Microbiome, 2017).
What this means for your result: A measured yeast proportion describes the day the sample was taken. It is a snapshot. Anyone who derives a permanent characteristic of their gut from it is overinterpreting the number.
Where a fungus is located determines how it is detected
The gut is the first location. The sample is stool, the procedure takes place in the laboratory, and the result is a colonization, expressed as a proportion of the total flora. Colonization means that an organism is present at this location.
The vagina is the second location, and it has its own procedure. The vaginal flora is the community of bacteria and yeasts in the vagina; yeasts are part of it.
Documented source
“Vaginal yeast infections are mainly caused by yeasts, more precisely by the pathogen Candida albicans. Although these fungi belong to the natural vaginal flora, they normally occur only in small numbers.”
gesundheitsinformation.de (IQWiG)
“Vaginal yeast infection,” 2026
The same source describes how a vaginal yeast infection is diagnosed: “As a rule, a vaginal yeast infection can be identified by the symptoms and visible changes to the vaginal mucosa. If there is any doubt, the gynecologist takes a sample of vaginal fluid and examines it for yeast fungi” (IQWiG, 2026). The source also names typical symptoms: “Itching, an unpleasant burning sensation, and pain” (IQWiG, 2026). This process takes place in a medical practice, not via a stool sample. An intestinal test cannot show a vaginal yeast infection. Information about dietary questions related to this topic can be found in a separate article: Diet for vaginal yeast infection.
The skin and nails are the third location. Here too, the rule is: a separate location, a separate detection method. Skin flakes are examined, and this is done in a medical practice. A stool sample says nothing about this.
What an intestinal test measures about yeasts
An intestinal test begins at home with a stool sample and ends in the laboratory. There, the genetic material of the microorganisms in the sample is read. The procedure is called DNA sequencing; it identifies bacterial species by their genetic material. The human genetic material is not examined. The article Stool microbiome test explains how such a sample is collected and what a stool test is in general.
The following table places the four terms side by side that have become mixed up in the search. The column discussed in this article is highlighted.
Location, detection method, and threshold in comparison
| Criterion | Yeasts in the intestine | Vaginal yeast infection | Skin and nail fungus | "Fungi in the body" |
|---|---|---|---|---|
| Where | In the intestine, alongside the bacteria of the intestinal flora | In the vagina, as part of the vaginal flora | On the skin, on nails | No location - the term does not refer to a place where something was found |
| How detectable | Stool sample, laboratory analysis, result as a proportion of the flora | Through symptoms and examination of vaginal fluid in a medical practice (IQWiG 2026) | Through skin flakes, examined in a medical practice | Not at all, because it is not a finding |
| What a gut test shows about this | The proportion, meaning the part of the microbiota made up by yeasts | Nothing | Nothing | Nothing |
| Who interprets it | A medical practice if you have symptoms; without symptoms, as a personal baseline assessment | Gynecologist (IQWiG 2026) | Medical practice | No one - the question must first be assigned to a specific site |
What a gut test says about fungi
The parameter list for the gut microbiome test | Essential by mybody®x (MYBODY Lab GmbH) lists two lines on fungi: “yeast colonization” and “mold colonization” (product page, accessed on 14/09/2026). It also lists key microorganisms and their ratios. Key microorganisms are individual groups of bacteria that can be used to determine the composition of the microbiota. The list also includes the intestinal environment, meaning the chemical conditions in which these organisms live, and the pH value of the stool, which indicates how acidic or alkaline the sample is.
Essential measures fungal colonization as a proportion, not as a diagnosis. The article Microbiome diversity: understanding the results explains what a result indicates about the diversity of the microbiota beyond that and how to interpret the values.
Gut test using a stool sample
Gut microbiome test | Essential
Stool sample collected at home, analyzed in the laboratory by DNA sequencing of more than 1,500 bacterial species: key microorganisms and their ratio, the stool environment and pH value, “yeast colonization” and “mold colonization” (parameter list from the product page, accessed on 14/09/2026). Essential measures fungal colonization as a proportion, not as a diagnosis. It says nothing about the skin or vagina and, according to the product page, does not provide a medical assessment.
Chapter at a glance
A gut test analyzes a stool sample in a laboratory and reports the proportion of yeasts in the microbiota. This proportion is a snapshot from the day the sample was taken, not a diagnosis. A stool sample says nothing about the vagina or the skin, as both sites require their own testing methods. If you have symptoms, the findings should be assessed by a medical practice.
Three misconceptions about detecting fungi
Three assumptions appear in forums and comment sections. All three can be answered with what has been substantiated up to this point.
Assumption and evidence
Widespread
“Detecting a fungus in the stool means I am ill.”
Substantiated
In 317 stool samples from healthy adults, Candida albicans was found in 80.8% of the samples (Nash et al., Microbiome, 2017). Detection alone does not distinguish anyone from healthy people.
Widespread
“I can tell from my stool whether I have Candida.”
Substantiated
Detecting yeasts requires laboratory analysis of the sample (parameter list on the product page, accessed on 14.09.2026). No fungus can be identified from the appearance of the stool.
Widespread
“A spit test in a glass of water shows fungi in the body.”
Substantiated
A vaginal yeast infection is diagnosed through symptoms and an examination of vaginal discharge (IQWiG, 2026), while yeasts in the gut are detected through laboratory analysis of a stool sample. A glass of water is not a detection method.
There is a separate article on the second point because the question about appearance is so widespread: White Pieces in Stool. What can be said about what is supposed to happen when Candida dies off is explained here: Symptoms When Candida Dies Off.
What self-tests without a laboratory can do
Self-tests that do not require a laboratory are not laboratory procedures and do not detect a fungus. Anyone who takes the term “self-test” seriously ultimately ends up with two options again: a sample analyzed by a laboratory - or a practice that examines the place where it itches.
When it is time to see a doctor
There are situations in which no home test is the right next step. For vaginal symptoms, the examination belongs in a gynecological practice; the symptoms mentioned are “itching, an unpleasant burning sensation and pain” (IQWiG, 2026). Changes to the skin or nails also belong in a medical practice, because that is where the appropriate sample is taken.
The same applies to persistent intestinal symptoms. A gut test describes a composition; it does not replace medical evaluation. And anyone with a weakened immune system should always have symptoms medically evaluated rather than interpreting them themselves.
A gut test measures yeasts as a proportion. It does not measure whether you are ill.
This distinction is not a weakness of the method, but its description: it measures a composition, and it measures it on one day.
What you can do now
The first step is not a test but an assignment. Ask yourself where the symptom is located. If the vagina itches or burns, the next step is a gynecological practice. If the skin or nails change, a skin scraping is examined there.
If the gut remains the focus of the question, a gut test is an inventory of your flora - including the key organisms and yeast colonization. It answers the question “What does my gut flora look like on the day of the sample?”, but it does not answer the question “Where are my symptoms coming from?”.
And the search term that started it all? It led you to a better question. Not “Do I have fungi in my body?” but: “Which site, which sample, who interprets the result?” There are answers to this question.
Frequently asked questions
Is there a test that detects fungi throughout the body?
No. Every detection method examines a sample from a specific site: a stool sample for the gut, vaginal discharge for the vagina (IQWiG, 2026). For skin and nails, it is a skin scraping. “Fungi in the body” is therefore a search term, not a finding. Anyone who wants to know what is going on should first assign the symptom to a site and then choose the appropriate method.
Does detecting yeast in a gut test result mean that something is wrong?
Detection alone does not mean that. In 317 stool samples from healthy adults in the Human Microbiome Project, Candida albicans was found in 80.8 percent and Saccharomyces cerevisiae in 96.8 percent of the samples (Nash et al., Microbiome, 2017). A result therefore indicates a proportion, not a yes-or-no switch. The Essential measures fungal colonization as a proportion, not a diagnosis. A medical practice interprets the result when symptoms are present.
Can I tell from my stool whether Candida is present?
No, a fungus cannot be identified from the appearance of stool. Detecting yeast requires laboratory testing of the sample. What is visible in stool says nothing about yeast; there is a separate article about white pieces in stool. Anyone seeking a reliable statement about colonization needs a sample that a laboratory can analyze.
Can a gut test show whether I have a vaginal yeast infection?
No. A vaginal yeast infection is identified at a different site: “As a rule, a vaginal yeast infection can be recognized by the symptoms and visible changes in the vaginal mucosa. If there is any doubt, the gynecologist takes a sample of vaginal discharge and examines it for yeast” (IQWiG, 2026). A stool sample does not reflect this site. Anyone with vaginal symptoms should visit a gynecological practice.
How long is a measured yeast proportion valid?
It describes the day the sample was collected. In essence, according to Nash et al., Microbiome, 2017: The fungal community varied greatly between individuals and within the same individual, and a person's mycobiome was no more similar to itself over time than to that of another person. A proportion is therefore a snapshot, not a fixed characteristic. Anyone who wants to see changes should measure again at a later time.
Next step
When the gut is the question, start with the sample
The gut flora microbiome test | Essential analyzes a stool sample in the laboratory and shows the colonization by yeasts as a proportion of your flora. What it does not show is explained in this article just as clearly as what it does show.
View the gut flora microbiome test Learn to read your test resultsRead more
You may also be interested in
How the sample is collected at home and what to consider when shipping it to the laboratory.
Which symptoms are associated with the composition of the gut flora.
Sources
- Nash A. K. et al.: The gut mycobiome of the Human Microbiome Project healthy cohort, Microbiome 5:153 (as of 2017) - europepmc.org
- gesundheitsinformation.de (IQWiG): Fungal infection of the vagina (vaginal yeast infection) (as of 2026) - gesundheitsinformation.de
All figures on yeasts in the intestines of healthy adults and on fluctuations in the mycobiome are based on [1]. The information on vaginal yeast infections is based on [2]. Information on the test scope and processing time comes from the mybody®x product page, accessed on 14.09.2026.
mybody®x Editorial & Expert Team
Gut health Microbiome
This article is produced by the mybody®x editorial team using verified sources and information from its own product pages. The contributors are listed on the authors page.
Published on 14.09.2026 · Last updated on 14.09.2026
Our products are not intended to diagnose, treat, cure, or prevent diseases. The content is for general information only and does not replace medical advice, diagnosis, or treatment. Reference ranges depend on the laboratory, method, and age - the information on your report is always decisive.
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