GI 360 Stool Test

Why a Comprehensive Stool Analysis Can Be Useful

Chronic gastrointestinal symptoms are not always caused by one infection. Bloating, constipation, diarrhea, abdominal discomfort, food intolerance, fatigue, or poor nutrient status may result from several problems occurring together.

These may include:

• Loss of beneficial bacteria
• Reduced microbiome diversity
• Overgrowth of opportunistic organisms
• Pathogenic bacterial infection
• Yeast or fungal overgrowth
• Parasitic infection
• Low short-chain fatty-acid production
• Pancreatic enzyme insufficiency
• Fat or carbohydrate malabsorption
• Intestinal inflammation
• Abnormal mucosal immune activity

GI360 Evaluates the Intestinal Ecosystem

A healthy intestine contains a diverse community of microorganisms living in a relatively stable ecological relationship.

These organisms do much more than occupy space. Beneficial bacteria can:

• Compete with pathogens for nutrients and attachment sites
• Help prevent colonization by undesirable organisms
• Produce short-chain fatty acids
• Support intestinal epithelial cells
• Influence the mucus layer and intestinal barrier
• Participate in bile-acid metabolism
• Contribute to B-vitamin and nutrient metabolism
• Interact with mucosal immunity
• Help regulate inflammatory signaling
• Participate in gut-brain communication

Dysbiosis therefore may involve both a gain of potentially harmful microbial activity and a loss of protective microbial functions.

Microbiome Abundance, Diversity and Normobiosis

The GI360 microbiome component uses PCR-based profiling to characterize the abundance of selected bacterial groups and compare the overall result with an established reference pattern.

The report includes graphical information showing bacterial abundance and diversity, helping identify whether the intestinal community has shifted away from the expected healthy pattern.

What Beneficial Bacteria Normally Provide

Short-Chain Fatty Acids: Butyrate, Acetate, Propionate and Valerate

GI360 measures important microbial fermentation products that help show what the microbiome is actually doing metabolically.

Gut Inflammation and Immune Activity

GI360 includes several markers that help distinguish simple microbial imbalance from a more inflammatory gastrointestinal process.

Why Intestinal Inflammation Matters Beyond Digestion

Persistent intestinal inflammation can become a continuing source of systemic immune and metabolic stress.

Inflammatory signaling may contribute to:

• Fatigue
• Reduced stress tolerance
• Increased oxidative stress
• Greater antioxidant demand
• Immune reactivity
• Poor nutrient utilization
• Altered mitochondrial function
• Incomplete response to otherwise appropriate treatment

When barrier integrity is impaired, microbial components such as bacterial lipopolysaccharide and other inflammatory products may also interact more strongly with the immune system.

How Gut Dysfunction Can Affect Methylation

The gastrointestinal tract is highly relevant to methylation because one-carbon metabolism depends on nutrients, amino acids, cellular energy, antioxidant balance, and control of inflammatory stress.

Dysbiosis, poor digestion, malabsorption, infection or intestinal inflammation may influence methylation through several pathways.

Methylation, Homocysteine and Glutathione

The relationship becomes clearer when the methionine cycle and transsulfuration pathway are viewed together.

SAM provides methyl groups for numerous reactions. After methyl donation, SAM becomes SAH and then homocysteine.

Homocysteine can then be recycled back toward methionine or moved into transsulfuration:

When oxidative stress increases, more glutathione may be consumed. This can increase metabolic demand for:

• Cysteine
• Glycine
• Vitamin B6
• Selenium
• ATP
• Antioxidant recycling
• Homocysteine and sulfur metabolism

Why Methylation Support Alone May Not Be Enough

A patient can receive methionine, SAMe, creatine, B vitamins, minerals or other methylation support and still have an incomplete response if a major source of metabolic stress remains active.

Examples include:

• Persistent intestinal infection
• Loss of beneficial bacteria
• Chronic inflammatory signaling
• Poor pancreatic digestion
• Nutrient malabsorption
• Low butyrate production
• High oxidative stress
• Increased glutathione demand

GI360 and the Gut-Brain Connection

The relationship between intestinal dysfunction and mood is multifactorial.

There is first the direct emotional burden of chronic bloating, pain, constipation, diarrhea, urgency, restricted diets and sleep disruption.

The intestine also communicates with the nervous system through:

• Immune and cytokine signaling
• Short-chain fatty acids
• Microbial metabolites
• Tryptophan metabolism
• Vagal signaling
• Enteric nervous-system pathways
• Nutrient availability
• Oxidative and inflammatory signaling

Pancreatic Elastase: Is Food Being Digested Properly?

GI360 measures fecal pancreatic elastase, which provides information about pancreatic digestive enzyme output.

Low pancreatic elastase may help explain:

• Fatty or greasy stool
• Bloating after meals
• Poor digestion
• Unexplained weight loss
• Fat-soluble vitamin deficiency
• Multiple nutrient deficiencies
• Difficulty maintaining weight

This matters because treating dysbiosis alone may not correct symptoms if food is not being adequately digested and absorbed.

Fat, Carbohydrates, Muscle Fibers and Vegetable Fibers

Stool pH and the Microbial Environment

GI360 also measures stool pH.

The colonic chemical environment is influenced by microbial fermentation, diet, transit time and short-chain fatty-acid production.

Stool pH is not diagnostic by itself, but it can add useful context when interpreted with:

• SCFA production
• Microbiome composition
• Carbohydrate fermentation
• Dietary intake
• Transit time
• Dysbiosis patterns

GI Pathogen PCR

GI360 includes molecular PCR testing for selected clinically important gastrointestinal pathogens.

PCR detects organism-specific genetic material and complements microbiome profiling and traditional culture.

Bacterial Culture

Traditional stool culture remains useful because it identifies organisms that grow under laboratory conditions and complements molecular testing.

Culture can provide additional information about:

• Potentially pathogenic bacteria
• Dysbiotic or opportunistic organisms
• Abnormal bacterial growth patterns
• Organisms suitable for susceptibility testing when available

Yeast and Fungal Overgrowth

GI360 includes yeast culture.

Yeast such as Candida may expand after antibiotic exposure, dietary changes, immune disruption or broader microbial imbalance.

Possible associated symptoms can include:

• Bloating
• Gas
• Altered bowel habits
• Post-antibiotic gastrointestinal symptoms
• Food-related discomfort
• Fatigue in some patients

Parasite Testing

GI360 includes parasitology using concentration and trichrome methods.

Testing may be especially useful with:

• Persistent or recurrent diarrhea
• International travel
• Camping or untreated water exposure
• Household or daycare exposure
• Abdominal cramping
• Unexplained anemia or nutrient depletion
• Eosinophilia when clinically appropriate
• Persistent GI symptoms following travel

Parasites are not present in most people in developed countries, but they remain clinically important and prevalence can be considerably higher in selected exposed or symptomatic populations.

Secretory IgA and Mucosal Immunity

Secretory IgA, or sIgA, is an important immune defense lining the gastrointestinal tract.

It helps:

• Bind microbes and foreign antigens
• Limit microbial attachment to intestinal surfaces
• Regulate interaction between the immune system and microbiome
• Support mucosal immune defense

Abnormal sIgA can provide useful context about the mucosal immune environment when interpreted with symptoms, inflammation and microbiome findings.

Calprotectin and Significant Gut Inflammation

Calprotectin is particularly important because significant elevation can indicate intestinal inflammation that deserves further conventional gastrointestinal evaluation.

It can help distinguish a predominantly functional symptom pattern from one in which inflammatory bowel disease or another inflammatory process should be considered.

GI360 and Intestinal Permeability / Leaky Gut

GI360 provides substantial information about the intestinal environment, but it does not directly answer every question about intestinal permeability.

Findings that may increase concern for impaired barrier function include:

• Significant dysbiosis
• Low beneficial bacteria
• Reduced butyrate
• Elevated inflammatory markers
• Abnormal secretory IgA
• Persistent food-related symptoms
• Autoimmune patterns
• Chronic gastrointestinal inflammation

When the specific clinical question involves intestinal permeability or celiac disease, separate zonulin and celiac testing may provide additional information.

View Leaky Gut / Zonulin + Celiac Testing

GI360 vs Culture, PCR + Parasitology

GI360 and the Culture, PCR + Parasitology profile overlap in their evaluation of gastrointestinal organisms, but GI360 provides a substantially broader functional assessment.

Which Gut Test Should You Choose?

When GI360 May Be Particularly Useful

What Can GI360 Help Answer?

• Is the microbiome broadly balanced or dysbiotic?
• Is bacterial diversity reduced?
• Are beneficial microbial functions being lost?
• Is a specific GI pathogen present?
• Is yeast overgrowth present?
• Is there evidence of parasitic infection?
• Are short-chain fatty acids adequate?
• Is pancreatic enzyme output adequate?
• Is there evidence of fat or carbohydrate malabsorption?
• Is intestinal inflammation present?
• Is mucosal immune activity abnormal?
• Is occult gastrointestinal bleeding present?
• Could gut dysfunction be contributing to oxidative stress or abnormal methylation?
• Would more focused CPP testing be sufficient instead?
• Should separate zonulin/celiac testing be considered?

GI360 Test Components

Analyte	CPT	Clinical Information
Microbiome Abundance – PCR	87999	Bacterial abundance, diversity and deviation from normobiosis
GI Pathogens PCR	87507	Selected clinically important gastrointestinal pathogens
Bacteriology Culture	87045 / 87046	Culturable pathogenic, opportunistic and dysbiotic bacteria
Yeast Culture	87102	Yeast and fungal growth
Parasitology	87177 / 87209	Protozoa, ova and other parasitic findings
Pancreatic Elastase	82656	Pancreatic digestive enzyme output
Calprotectin	83993	Intestinal inflammatory activity
Lactoferrin	83631	Inflammatory white-cell activity in the gastrointestinal tract
Secretory IgA	82784	Mucosal immune defense
Lysozyme	85549	Innate intestinal immune activity
Butyrate	82542	Beneficial microbial fermentation and colon-cell support
Acetate, Propionate & Valerate	Varies	Short-chain fatty-acid production and microbial metabolism
Fat Stain	89125	Fat digestion and absorption
Carbohydrates	—	Carbohydrate digestion and malabsorption
Muscle Fibers	89160	Protein digestion
Occult Blood	82272	Hidden gastrointestinal bleeding
Stool pH	83986	Overall colonic chemical and fermentation environment
Red & White Blood Cells	—	Additional evidence of bleeding or inflammation
Mucus & Vegetable Fibers	—	Additional digestive and microscopic stool findings

How the GI360 Test Works

Interpreting GI360 Results

GI360 is most useful when findings are interpreted together rather than treating each abnormality independently.

• Low beneficial bacteria + low butyrate: may indicate loss of protective fermenting flora.
• Elevated calprotectin + occult blood: may indicate a need for conventional gastrointestinal evaluation.
• Low pancreatic elastase + excess stool fat: may suggest impaired pancreatic digestion.
• Pathogen + elevated inflammatory markers: may indicate a more active infectious/inflammatory process.
• No major pathogen + marked dysbiosis: may indicate an ecological rather than single-organism problem.
• Dysbiosis + abnormal methylation or oxidative-stress findings: may identify gastrointestinal stress as a contributor to a broader biochemical pattern.

Frequently Asked Questions

What is the difference between GI360 and a basic stool test?

A basic stool test may focus mainly on pathogens or parasites. GI360 adds microbiome abundance and diversity, SCFAs, pancreatic function, digestive markers, intestinal inflammation, mucosal immunity, occult blood and other functional markers.

Does GI360 test for dysbiosis?

Yes. The microbiome PCR component evaluates bacterial abundance and diversity and compares the overall community with an established normobiotic reference pattern.

Can dysbiosis affect methylation?

Yes, potentially. Dysbiosis can influence B-vitamin and amino-acid availability, inflammation, oxidative stress, glutathione demand and mitochondrial energy requirements. Persistent gut dysfunction can therefore become an acquired biochemical stressor affecting methylation.

How does the gut affect glutathione?

Infection, inflammation and dysbiosis can increase oxidative stress and therefore glutathione utilization. Glutathione production is connected to homocysteine through the transsulfuration pathway, linking antioxidant demand directly with methylation chemistry.

Does GI360 test for parasites?

Yes. The profile includes stool parasitology using concentration and trichrome methods.

Does GI360 test for Candida?

Yes. The profile includes yeast culture. A positive yeast result should be interpreted with quantity, symptoms and the broader microbiome pattern.

What does low pancreatic elastase mean?

Low stool elastase may indicate reduced pancreatic digestive enzyme output and can contribute to maldigestion, fatty stools, weight loss and nutritional deficiencies.

Why is butyrate important?

Butyrate is produced by beneficial intestinal bacteria and serves as an important fuel for colon cells while supporting barrier integrity and local immune regulation.

Can gut problems affect mood?

They can contribute. Chronic gastrointestinal discomfort can directly affect sleep, stress and quality of life, while inflammatory, immune, microbial-metabolite and gut-brain signaling pathways may also play a role.

Does an abnormal GI360 mean I need antibiotics?

No. Treatment depends on the pattern. Some findings may suggest dietary change, restoration of beneficial flora, pancreatic support, treatment of a specific infection, further GI evaluation, or other targeted approaches.

When should I choose CPP instead?

The Culture, PCR + Parasitology profile is a lower-cost, more focused choice when the main question is bacterial infection, dysbiosis, yeast or parasites rather than comprehensive gut physiology.

Does GI360 measure leaky gut?

GI360 evaluates many factors associated with intestinal health but does not directly answer every question about intestinal permeability. If leaky gut or celiac disease is a specific concern, separate zonulin and celiac testing may be useful.

The Bottom Line