InstalabGI Effects Microbial
Should you take a GI Effects Microbial test?
This test is most useful if any of these apply to you.
76 biomarkers included
- Infectious39
- Salmonella SpeciesA recognized bacterial cause of gastroenteritis screened by culture.A positive result indicates a true infection needing medical follow-up and possible susceptibility testing.
- Shigella SpeciesA bacterial pathogen that causes dysentery and inflammatory diarrhea.Detection points to a genuine infection rather than an incidental finding.
- Yeast, not Candida AlbicansA catch-all for non-albicans yeast that may expand in a disturbed gut.Its presence flags fungal overgrowth to weigh against symptoms and bacterial balance.
- Ancylostoma / Necator (Hookworm)Blood-feeding intestinal worms that attach to the gut wall.A positive result can explain iron-deficiency anemia and calls for treatment.
- Ascaris LumbricoidesThe largest human intestinal roundworm, acquired through contaminated food or soil.Heavy infection can obstruct the bowel and warrants deworming.
- Capillaria PhilippinensisA roundworm from raw fish that can cause severe malabsorption.Detection is significant because untreated infection can lead to protein loss and wasting.
- Enterobius Vermicularis (Pinworm)A common intestinal worm, especially in children, that lays eggs around the anus.Detection explains perianal itching and is readily treated.
- Strongyloides StercoralisA roundworm that can silently persist for years and multiply within the body.Detection matters greatly because it can become life-threatening if immunity drops, so it warrants treatment.
- Trichuris Trichiura (Whipworm)A soil-transmitted worm that lodges in the large intestine.Heavy burdens cause chronic diarrhea and, in children, rectal prolapse.
- Diphyllobothrium Latum (Fish Tapeworm)A tapeworm acquired from undercooked freshwater fish.It can cause vitamin B12 deficiency by competing for the vitamin.
- Dipylidium Caninum (Flea Tapeworm)A tapeworm spread by fleas, seen mainly in young children with pet exposure.Detection points to a pet-associated tapeworm and prompts treatment.
- Hymenolepis DiminutaA rat tapeworm that occasionally infects humans, usually via insects.A positive result indicates an uncommon zoonotic tapeworm infection.
- Hymenolepis Nana (Dwarf Tapeworm)The most common human tapeworm, able to complete its cycle without an intermediate host.It can self-reinfect the host, so detection warrants treatment.
- Taenia Species (Beef and Pork Tapeworm)Tapeworms acquired from undercooked beef or pork.The pork species carries added risk of tissue cysts, making detection important.
- Clonorchis/Opisthorchis Species (Liver Fluke)Flukes acquired from raw freshwater fish that lodge in the bile ducts.Chronic infection is associated with biliary disease and elevated bile-duct cancer risk.
- Fasciola Species/Fasciolopsis BuskiFlukes acquired from aquatic plants that affect the liver or intestine.Detection can explain biliary or intestinal symptoms and needs targeted therapy.
- Heterophyes/MetagonimusSmall intestinal flukes acquired from raw or undercooked fish.A positive result indicates a treatable intestinal fluke infection.
- Paragonimus Species (Lung Fluke)A fluke from undercooked crustaceans that can migrate to the lungs.Its presence can mimic tuberculosis and warrants specific treatment.
- Schistosoma Species (Blood Fluke)Blood flukes acquired through freshwater contact that damage the bladder or liver.Detection signals a serious infection with long-term organ risks if untreated.
- Balantidium ColiThe largest protozoan to infect humans, often tied to pig contact, capable of causing colitis.Detection can indicate genuine, sometimes invasive infection needing clinical attention.
- Blastocystis Species — MicroscopyThe DNA-based detection of Blastocystis, more sensitive than microscopy.Even confirmed, it is often colonization, so it is weighed against symptoms and other findings.
- Chilomastix MesniliA non-pathogenic flagellate that indicates fecal-oral exposure.It serves as a marker of exposure, not a cause of gastrointestinal disease.
- Cryptosporidium SpeciesA protozoan that causes watery diarrhea and can be severe in weakened immune systems.Detection signals a real infection, especially important if immunity is compromised.
- Cyclospora CayetanensisThe DNA-based confirmation of Cyclospora, catching cases microscopy can miss.A molecular positive supports a treatable, produce-associated diarrheal infection.
- Dientamoeba Fragilis — MicroscopyThe DNA-based detection of this protozoan, which finds it far more often than microscopy.A positive still needs clinical context, since it is common in people without symptoms.
- Entamoeba ColiA non-disease-causing amoeba often reported alongside true pathogens.Its presence is mainly a marker of fecal exposure, not a cause of illness.
- Entamoeba Histolytica/DisparA microscopy result that cannot separate disease-causing E. histolytica from its harmless look-alike E. dispar.A positive requires species-specific confirmation before assuming true amoebic disease.
- Entamoeba HartmaniiA small, non-pathogenic member of the Entamoeba group.Its detection reflects colonization rather than an illness-causing organism.
- Entamoeba PoleckiAn uncommon amoeba usually regarded as commensal in humans.A positive result rarely indicates true disease on its own.
- Endolimax NanaA classic commensal amoeba of the human gut.Detection reflects exposure and colonization rather than disease.
- Giardia — MicroscopyThe DNA-based confirmation of Giardia, more sensitive than microscopy alone.A molecular positive strongly supports a true, treatable Giardia infection.
- Iodamoeba BuetschliiAnother commensal amoeba found at low prevalence in stool.Its presence is not linked to symptoms and generally needs no treatment.
- Cystoisospora SpeciesA protozoan that causes diarrhea, most significant in people with weakened immunity.A positive result points to a true infection, particularly relevant if immunocompromised.
- TrichomonadsIntestinal flagellates (such as Pentatrichomonas) of uncertain significance in the gut.Detection is generally interpreted with caution rather than as a definite pathogen.
- Blastocystis Species — PCRThe DNA-based detection of Blastocystis, more sensitive than microscopy.Even confirmed, it is often colonization, so it is weighed against symptoms and other findings.
- Cryptosporidium Parvum/HominisSpecies-level DNA detection of the disease-causing Cryptosporidium types.It confirms an infection likely to cause watery diarrhea, especially if immunity is reduced.
- Dientamoeba Fragilis — PCRThe DNA-based detection of this protozoan, which finds it far more often than microscopy.A positive still needs clinical context, since it is common in people without symptoms.
- Entamoeba HistolyticaSpecies-specific DNA testing that distinguishes the pathogen from its harmless look-alike.A molecular positive confirms true amoebic infection rather than commensal E. dispar.
- Giardia — PCRThe DNA-based confirmation of Giardia, more sensitive than microscopy alone.A molecular positive strongly supports a true, treatable Giardia infection.
- Gastrointestinal7
- Enterobacter LudwigiiAn Enterobacteriaceae member that can rise when protective bacteria decline.Its expansion adds to a facultative-overgrowth signature within the panel.
- Klebsiella PneumoniaeAn Enterobacteriaceae organism that can bloom when colonization resistance is lost.Expansion signals an opportunistic overgrowth pattern rather than a fixed infection.
- Enterococcus FaeciumA facultative organism that can overgrow in a low-diversity gut.Higher levels point to reduced ecosystem resilience and opportunistic expansion.
- Candida KruseiiA yeast that can overgrow when bacterial balance and defenses are reduced.Notable growth suggests fungal overgrowth in the setting of disrupted gut balance.
- White Blood CellsA microscopy finding that flags immune cells shed into the stool.Their presence points to active inflammation in the gut worth investigating.
- Charcot-Leyden CrystalsCrystals formed from broken-down eosinophils, seen under the microscope.They suggest an allergic or parasite-related immune response in the gut.
- Clyospora CayetanensisA microscopic parasite that infects the small intestine and causes a prolonged, often relapsing diarrheal illness.
- Microbiome30
- Bacteroides UniformisA core Bacteroidetes commensal that ferments fiber and helps maintain a stable, diverse gut.Shifts in this abundant genus signal broad changes in your overall gut community structure.
- Phocaeicola VulgatusA common Bacteroidetes commensal (formerly Bacteroides vulgatus) involved in carbohydrate breakdown.Its abundance helps gauge the overall balance of Bacteroidetes in your gut.
- Barnesiella SpeciesA commensal that supports colonization resistance against drug-resistant and opportunistic organisms.Low abundance may indicate weaker natural defense against opportunistic overgrowth.
- Odoribacter SpeciesA short-chain fatty acid producer that supports barrier function and anti-inflammatory tone.Reduced levels reflect a thinning of the protective commensal community.
- Prevotella SpeciesA fiber-associated genus often abundant in people eating plant-rich, high-fiber diets.Its level helps place your gut within a diet-linked community type.
- Anaerotruncus Colihominis/MassiliensisA short-chain fatty acid producing commensal that adds to overall community diversity.Its presence contributes to a fuller, more resilient beneficial community.
- Butyrivibrio CrossotusA fiber fermenter named for its butyrate output that helps nourish the intestinal lining.Low abundance contributes to the loss of protective short-chain fatty acid producers.
- Clostridium SpeciesA broad group of anaerobic fermenters, most of which are ordinary commensals of a healthy colon.Shifts here reflect general changes in the fermentative community rather than a single organism.
- Coprococcus EutactusA butyrate-producing commensal associated with gut and mood-related health in population studies.Its depletion adds to a low-butyrate profile tied to reduced gut resilience.
- Faecalibacterium PrausnitziiThe most studied beneficial fiber-fermenter, producing anti-inflammatory short-chain fatty acids that feed and protect the colon lining.Low levels are the most consistent microbial signal of inflammatory gut states such as Crohn's disease and ulcerative colitis.
- Lactobacillus Species — PCRBeneficial lactic-acid bacteria confirmed by culture, complementing the DNA-based measure.Growth on culture corroborates the presence of these protective organisms.
- Pseudoflavonifractor SpeciesA butyrate-associated commensal that participates in fiber fermentation.Reduced levels add to a low short-chain fatty acid pattern of reduced gut resilience.
- Roseburia SpeciesA major butyrate producer that fuels colon cells and helps keep inflammation in check.Depletion alongside other butyrate producers marks the loss of protective bacteria seen in inflammatory bowel disease.
- Ruminococcus BromiiA keystone degrader that breaks down resistant starch other bacteria cannot, opening food sources across the community.Low levels can blunt fiber fermentation and short-chain fatty acid production across the whole ecosystem.
- Veillonella SpeciesA lactate-consuming commensal that helps recycle metabolites produced by other gut bacteria.Its abundance reflects cross-feeding activity within the community.
- Bifidobacterium SpeciesA broad group of beneficial bacteria that support digestion and immune balance from early life onward.Reduced abundance points to diminished colonization resistance against overgrowth organisms.
- Bifidobacterium LongumA specific beneficial species involved in immune training and carbohydrate fermentation.Low levels suggest a weakened beneficial community, often after antibiotics or a low-fiber diet.
- Collinsella AerofaciensA carbohydrate-fermenting commensal whose abundance shifts with diet and gut transit.Changes track dietary and metabolic influences on your gut community.
- Desulfovibrio PigerA hydrogen-sulfide-producing organism whose gas can irritate the intestinal lining.Higher levels are associated with sulfide-linked, diarrhea-type gut patterns.
- Escherichia Coli — PCRThe culture-based confirmation of this common organism, adding viability information the DNA measure cannot.Live growth confirms an active E. coli population rather than residual genetic material.
- Oxalobacter FormigenesA specialist commensal that breaks down dietary oxalate in the gut.Its absence is associated with higher oxalate and a greater tendency toward kidney stones.
- Methanobrevibacter SmithiiThe main methane-producing archaeon of the gut, distinct from bacteria.Higher abundance tends to track with methane-related, constipation-predominant symptoms.
- Fusobacterium SpeciesAn organism that can expand in a disrupted gut and has been studied in colorectal disease.Higher levels flag a potentially inflammatory shift worth interpreting alongside symptoms.
- Akkermansia MuciniphilaA mucin-associated commensal tied to a healthy gut barrier and better metabolic status in human studies.Reduced abundance is linked with poorer blood sugar control and metabolic imbalance.
- Lactobacillus Species — CultureBeneficial lactic-acid bacteria confirmed by culture, complementing the DNA-based measure.Growth on culture corroborates the presence of these protective organisms.
- Escherichia Coli — CultureThe culture-based confirmation of this common organism, adding viability information the DNA measure cannot.Live growth confirms an active E. coli population rather than residual genetic material.
- BifidobacteriumThe culture-based check for these beneficial bacteria, complementing the DNA measurement.Growth confirms viable beneficial Bifidobacterium in your sample.
- Alpha Haemolytic StreptococcusA cultured organism often from the mouth or upper tract that can appear when gut balance shifts.Higher culture growth can reflect an altered, less resilient gut environment.
- Gamma Haemolytic StreptococcusA cultured streptococcal group, typically ordinary enteric flora.Its growth mainly helps characterize the cultivable bacterial community.
- Bacillus SpeciesSpore-forming bacteria detected by culture, often transient from food or environment.Presence usually reflects ordinary intake rather than a pathogenic process.
About GI Effects Microbial
Your digestive tract holds trillions of microbes that help you break down food, train your immune system, and keep unwelcome organisms in check. When that community thins out or tips toward the wrong organisms, the fallout can look like bloating, unpredictable stools, or lingering fatigue. This panel reads your gut as an ecosystem rather than checking for one germ at a time.
It profiles the beneficial bacteria you rely on, the organisms that can overgrow when balance is lost, yeast, and a long list of parasites from a single stool sample. This combined view is used mainly in research and functional medicine settings, so it is best treated as an exploratory map of your gut rather than a finished diagnosis.
What This Panel Reveals
The largest part of the panel measures your beneficial bacteria, the workhorses of a resilient gut. Many of them ferment fiber into short-chain fatty acids (small molecules that feed the cells lining your colon and calm inflammation), and Faecalibacterium prausnitzii is the single most studied member of this group. When these fiber-fermenting bacteria are plentiful, they crowd out troublemakers and reinforce your gut barrier. Lower levels of them are repeatedly seen in inflammatory bowel disease, the umbrella term for Crohn's disease and ulcerative colitis.
A second group tracks organisms that are usually harmless in small numbers but can expand when the beneficial community shrinks. These include members of the Enterobacteriaceae family such as Escherichia coli and Klebsiella pneumoniae, along with yeast. The panel also measures gas-producing organisms: Methanobrevibacter smithii, a methane maker linked to constipation-type patterns, and Desulfovibrio piger, which produces hydrogen sulfide that can irritate the gut lining.
The final layer looks for true infection. It screens for bacterial pathogens like Salmonella and Shigella, established parasites such as Giardia and Cryptosporidium, a wide range of worms, and protozoa whose significance is still debated. Microscopy also flags white blood cells and Charcot-Leyden crystals, clues that point to active inflammation or an allergic or parasitic response.
How to Read Your Results Together
The value of this panel is in the patterns, not any single line. A few combinations are worth learning.
| Pattern | What It Suggests |
|---|---|
| Low fiber-fermenting bacteria (Faecalibacterium, Roseburia) with high Escherichia coli or Klebsiella | A dysbiosis pattern often seen in inflammatory bowel disease. Pair it with a gut inflammation marker before acting. |
| High Methanobrevibacter smithii | A methane-heavy pattern that tends to track with constipation rather than diarrhea. |
| A clearly disease-causing organism (Giardia, Cryptosporidium, Salmonella, Shigella, Entamoeba histolytica) | A likely true infection that warrants prompt medical follow-up. |
| An uncertain protozoan alone (Blastocystis, Dientamoeba fragilis, Endolimax nana) with no pathogens and no inflammation | Most often harmless colonization rather than the cause of symptoms. |
That last pattern matters because the friendlier reading is usually correct. In a study of 36,008 children, 32.5 percent carried Dientamoeba fragilis and 7.9 percent carried Blastocystis, yet carriers were generally no more likely to have symptoms than children who tested negative.
What to Do with Your Results
Start by separating infection from imbalance. A positive result for an established pathogen such as Giardia, Cryptosporidium, Salmonella, Shigella, or Entamoeba histolytica is the clearest call to action and should be reviewed with a clinician, who may confirm it with culture, since a DNA-based result cannot tell whether an organism is alive or provide antibiotic susceptibility. A dysbiosis pattern points toward diet and fiber changes rather than drugs, and retesting in three to six months shows whether the beneficial community is recovering. An uncertain protozoan on its own rarely needs treatment. If symptoms are significant, a gastroenterologist can add a stool inflammation marker such as calprotectin and integrate the panel with your history.
When Results Can Be Misleading
Several confounders hit the whole panel at once. A stool sample is a snapshot of a moving target: for 78 percent of gut bacterial groups, day-to-day swings within one person are larger than the differences between different people, with some shifting up to 100-fold. Recent antibiotics, a change in diet, or an acute illness can reshape the entire community for weeks. Stool also reflects the gut's open channel rather than the bacteria living against the intestinal wall, and there is no agreed definition of an ideal microbiome to measure yourself against. Molecular parasite testing is highly sensitive, detecting protozoa with 89.6% to 96.5% sensitivity compared with 59.6% for a microscopy-based method, but it detects genetic material rather than proof of active disease.