Stool Testing Kit: GI Effects

You’ve tried the probiotics. Cut out gluten, dairy, maybe sugar too. You’ve even gone through a colonoscopy or endoscopy, hoping for answers. And yet the bloating, the constipation or diarrhea, the reflux, the fatigue, the skin flare-ups, the brain fog… it’s all still there, with no explanation in sight.

The GI Effects stool test by Genova Diagnostics is a comprehensive stool test that goes far beyond a standard stool sample. It analyzes your digestion, intestinal inflammation, and gut microbiome in one collection kit, giving your dietitian a clear picture of what is happening inside your gut.

At The Nutrition Clinic for Digestive Health, our registered dietitians use the GI Effects as part of a functional nutrition approach to identify and address the root causes of digestive symptoms. Here’s everything you need to know about this at-home stool test and how it works.

What Is the GI Effects Stool Testing Kit?

The GI Effects is a comprehensive stool test developed by Genova Diagnostics. It uses three testing methods: PCR (polymerase chain reaction), culture, and microscopic examination. Together, these methods detect organisms and imbalances that a standard stool test isn’t looking for.

The test evaluates three core areas of gut health, organized in what Genova calls the “DIG” format. Each area reveals different pieces of the puzzle behind your symptoms. DIG stands for:

• Digestion and absorption
• Inflammation and immunology
• And the Gut microbiome.

You collect your stool sample at home using the provided collection kit. The kit ships directly to your door, and prepaid FedEx materials make returning your sample straightforward.

Why Traditional Testing Misses the Problem

A standard stool test looks for a short list of common pathogens and stops there. The GI Effects is different. It combines PCR, culture, and microscopic examination into a single report, so nothing falls through the cracks.

Here’s what they don’t assess, that the GI Effects test does (and we think it makes all the difference!):

• Digestion, pancreatic function, or how well you’re absorbing fat and protein.
• Microbiome diversity or which beneficial bacteria might be missing.
• Intestinal inflammation or immune activity in the gut.
• Short chain fatty acids like butyrate, which reflect how well your microbiome is functioning.

 

Who Should Consider a Stool Test for Gut Health?

A stool test for gut health is worth considering if you experience chronic or recurring symptoms that have not resolved with basic interventions. It’s also a valuable tool for anyone who simply wants a deeper look at their overall health.

Common GI symptoms that point to this test:

• Gas and bloating
• Abdominal pain or cramps
• Diarrhea or constipation
• Indigestion and reflux

But the GI Effects goes beyond digestive symptoms. Dysbiosis, or an imbalance in the gut microbial community, connects to conditions well outside the digestive tract.

Non-GI conditions where this test may offer insight:

• Skin conditions such as eczema or atopic dermatitis
• Joint aches
• Mood disorders including depression and anxiety
• Autoimmune concerns
• Weight issues

You may also benefit from this test if you want to:

• Understand your gut microbiome as a baseline for long-term health
• Optimize digestion, energy, and immune function
• Be proactive rather than reactive with your health care
• Get personalized, data-driven nutrition recommendations

If you’ve seen multiple providers without clear answers, or you simply want to take a deeper look at your health, this comprehensive stool test can help your dietitian build a targeted, personalized plan.

What Does the GI Effects Stool Testing Kit Actually Test?

The GI Effects report organizes results into five functional imbalance scores. Each score helps us identify where support is needed and build a targeted, personalized plan.

Maldigestion

This section evaluates how well your body breaks down and absorbs the food you eat. Poor scores here can help explain symptoms like bloating, gas, loose stools, and nutrient deficiencies even when no infection or inflammation is present. This section looks at:

• How well your pancreas produces digestive enzymes
• Whether undigested protein is reaching your colon, which can fuel inflammation and gas
• How well your body absorbs dietary fat

Inflammation

This section measures intestinal inflammation and immune activity in your gut. This matters because many digestive conditions have overlapping symptoms, yet require very different dietary approaches. This section looks at:

• The strength of your gut’s immune barrier
• Whether active inflammation is present using calprotectin, one of the most clinically validated gut inflammation markers available
• Signs of allergic-type inflammation in the gut

Dysbiosis

This section looks at the balance of bacteria and yeast living in your gut. A healthy microbiome is diverse and populated with beneficial bacteria. Dysbiosis occurs when this balance is disrupted. Research confirms that gut dysbiosis is closely linked to conditions like IBS. Using a dataset of over 173,000 stool results, Genova developed a dysbiosis score that helps your dietitian interpret your microbial balance in a clinically meaningful way. This section looks at:

• Whether your overall microbial balance is healthy or disrupted
• The levels of beneficial bacteria that support digestion, immunity, and inflammation control
• The presence of potentially harmful bacteria, yeast, or fungi
• Whether methane-producing organisms are present in your gut
• Whether parasites are present that could be contributing to your symptoms

Metabolic Imbalance

This section looks at what your gut bacteria are producing and whether those outputs support your health. 

A key marker here is butyrate, a short-chain fatty acid that feeds the cells lining your gut and helps maintain a strong intestinal barrier. This section also measures beta-glucuronidase, an enzyme that when elevated can affect your body’s ability to clear hormones and toxins. 

Research shows that changes in short-chain fatty acid production can have effects well beyond the gut, influencing mood, immunity, and overall wellbeing.

Infection

This section screens for active infections from harmful bacteria, yeast, and parasites. When infections are identified, the report also provides information on which natural and prescription agents are most effective against them. This section identifies:

• Harmful bacteria such as H. pylori, Clostridium difficile, Campylobacter, and E. coli
• Pathogenic yeast and fungal overgrowth
• Parasitic infections including Giardia, Cryptosporidium, and Blastocystis

Here’s a quick recap of what each score reveals:

Imbalance Score	What It Reveals
Maldigestion	How well you digest and absorb food
Inflammation	Whether inflammation or immune activity is present
Dysbiosis	Whether your microbial balance is healthy or disrupted
Metabolic Imbalance	Whether your gut bacteria are producing what your body needs
Infection	Whether harmful bacteria, yeast, or parasites are present

Example report: 

How the GI Effects Stool Collection Kit Works

The process is simpler than most people expect. At The Nutrition Clinic for Digestive Health, we order the test on your behalf. Genova ships the collection kit directly to your home. 

You collect your stool sample using the included materials, following the provided instructions carefully. You then return the sample using the prepaid shipping label.

The GI Effects is an incredibly valuable clinical tool, but it does not diagnose every digestive condition on its own. It cannot diagnose SIBO, celiac disease, food allergies, inflammatory bowel disease, or colon cancer. It is one piece of the overall clinical picture, interpreted alongside your symptoms, history, and other testing.

Interested in ordering a stool test? Book a free 15 minute call with us today and we’ll get one ordered for you.

Preparation Instructions for Genova’s GI Effects Stool Testing Kit 

We want to make sure your at home stool testing kit gives us the most accurate picture of your gut health possible. Here is what we recommend before you collect your sample:

Medications and supplements to pause before testing:

• Stop probiotics at least 2 to 4 weeks before your stool collection
• Stop antibiotics, antifungals, and antiparasitics at least 14 days before testing
• Stop proton pump inhibitors and other antacids as directed, as these can influence certain markers

Timing your collection:

• We recommend collecting your stool sample around the full moon. Parasites can be more active during this time, which increases the chances of detecting them in your sample. 

What to expect after testing:

• Results arrive 3-4 weeks after collection and we walk you through them, page  by page!
• We don’t simply hand you a report. We use your results to build an individualized nutrition and supplement protocol to support:
  • Improving digestion
  • Restoring beneficial bacteria
  • Treating infections when appropriate
  • Increasing butyrate production
  • Supporting intestinal healing
  • Improving motility
  • Personalized dietary recommendations

We support our clients each step of the way. If you have any questions during the testing process, we’re here to help. Reach out to us before your collection and we will guide you through every step.

 

FAQ: Stool Testing Kit

What does a stool testing kit test for?

The GI Effects stool testing kit evaluates digestive function, intestinal inflammation, gut immune markers, microbiome composition, and parasites. It also includes a fecal occult blood marker relevant to colorectal cancer screening.

How does a stool sample kit work?

We order the test and the lab ships it to your house. You collect your stool sample at home using the provided collection materials. You then drop the kit off at a FedEx store using the prepaid label. Results are processed and made available online, typically within three weeks.

Interested in ordering a stool test? Book a free 15 minute call with us today and we’ll get one ordered for you.

Why does the GI Effects use PCR, culture, and microscopy together?

Each method catches something the others can miss, so combining them gives a more complete picture than any single method alone.

• PCR: Excellent sensitivity and detects organism DNA directly
• Culture: Confirms actual organism growth and allows sensitivity testing to guide treatment
• Microscopy: Identifies organisms that molecular testing can miss and can visualize certain parasite forms directly

What makes GI Effects different?

Not all stool tests are built the same, the GI Effects is really comphrehensive. Also, the 3-day collection period gives us multiple samples so we have a great overview of what’s going on in the digestive tract.. The GI Effects combines PCR, culture, and microscopy with digestive markers, inflammatory markers, immune markers, and metabolic markers in a single report. For patients who need a deeper look, the add-on Microbiomix module provides advanced metagenomic analysis beyond what the standard panel covers.

Are home stool tests reliable?

The GI Effects uses validated laboratory methods including PCR, culture, and microscopy. One study using over 173,000 stool profiles validated the clinical accuracy of microbiome and inflammation biomarkers used on this type of comprehensive stool test. Our clinic always interprets results in the context of your full health picture, and find that the results align very well with the symptoms patients experience.

Why does interpretation of the test matter?

At The Nutrition Clinic for Digestive Health, we have interpreted hundreds of comprehensive stool tests. Rather than focusing on one abnormal marker in isolation, we look for patterns and connect your stool test with your symptoms, blood work, medications, nutrition, and medical history to build a personalized plan.

Does it matter where I am located?

We ship stool testing kits across the United States. Once your kit arrives, you complete your collection at home and drop it off at your nearest FedEx store using the prepaid label included in your kit. Please note that a couple of states have limitations on testing, but reach out to us and we will let you know what is available in your area.

Do stool test kits expire?

Yes. Every stool testing kit carries an expiration date printed on the packaging. Do not use a kit past its expiration date, as this can affect the accuracy of your test results. Contact your dietitian if your kit has expired.

How fresh does a stool sample have to be for testing?

Stool samples should be processed promptly. Genova recommends shipping specimens within 24 hours of the final collection. You have 10 days from your first sample collection date to collect all three days worth of stool samples. Always be sure to follow the instructions in your collection kit carefully. 

Ready to Get Started?

If you’re dealing with persistent digestive symptoms or a health concern that connects back to gut health, the GI Effects stool testing kit is a powerful starting point. Our team of registered dietitians at The Nutrition Clinic for Digestive Health will help you understand your results and build a clear, evidence-based plan.

Schedule a free 15 minute call with us to learn whether stool testing is right for you.