Quick answer: A comprehensive stool test is a lab panel that looks at how well you digest food, signs of inflammation in the gut, the balance of beneficial and problem bacteria, and possible infections such as parasites or yeast, all from one at-home sample. At Dr. Harrison’s Center of Functional Medicine in Westminster, CO, stool testing is one part of a lab-testing-first workup for people with ongoing bloating, irregular bowels, food reactions, or symptoms that seem connected to the gut.
What is a comprehensive stool test?
A standard stool test ordered in a primary care office usually answers one narrow question, such as “is there blood in the stool?” or “is there a specific infection?” A comprehensive stool panel is broader. It is designed to give a picture of how the whole digestive system is working, not just whether one thing is present or absent.
Functional medicine practitioners commonly use panels from specialty labs, such as the GI-MAP or GI Effects. The exact test chosen depends on your history and symptoms. You collect the sample at home using a kit, ship it to the lab, and the results are reviewed with you in detail.
What does a comprehensive stool test check?
Most comprehensive panels group their results into a few areas:
- Digestion and absorption: markers that suggest whether you are breaking down fats and proteins well, and whether the pancreas is producing enough digestive enzymes.
- Inflammation: markers such as calprotectin that reflect inflammation in the lining of the gut.
- Gut immune activity: markers such as secretory IgA, which reflect how the immune system in the gut is responding.
- Bacterial balance: levels of beneficial bacteria and of bacteria that can cause problems when they overgrow.
- Possible infections: screening for parasites, yeast such as Candida, and bacteria such as H. pylori, depending on the panel.
No single marker tells the whole story. The value is in looking at the pattern together, alongside your symptoms and your other labs.
Who should consider a stool test?
People usually ask about comprehensive stool testing when they have been living with digestive symptoms for months or years without clear answers. Common reasons include:
- Bloating, gas, or abdominal discomfort that keeps coming back
- Constipation, loose stools, or alternating between the two
- Reacting to more and more foods over time
- Skin, energy, or mood symptoms that seem to flare with digestive problems
- An autoimmune condition, where gut health is often part of the conversation
If that sounds familiar, you may also want to read our guides on IBS vs. SIBO and getting to the bottom of a bloated, painful stomach.
Stool test vs. SIBO breath test vs. food sensitivity test: what is the difference?
These three tests are often confused, and they answer different questions:
- Comprehensive stool test: looks at the large intestine, digestion, inflammation, and the balance of bacteria and possible infections.
- SIBO breath test: looks for bacterial overgrowth in the small intestine, which a stool test cannot measure directly.
- Food sensitivity testing: looks at how your immune system responds to specific foods. Learn more on our allergies and food sensitivities page.
Depending on your symptoms, one, two, or all three may be useful. Part of a good workup is deciding which tests are actually worth running for you.
How stool testing fits into care at our Westminster clinic
At Dr. Harrison’s Center of Functional Medicine, lab testing comes before any plan. A stool test is rarely looked at on its own. It is reviewed together with bloodwork and, when appropriate, other functional lab testing, because digestive symptoms often overlap with thyroid, blood sugar, stress hormone, and immune patterns.
Dr. Glenn Harrison, DC, has focused on chronic health issues for more than 10 years. Results are used to build a personalized Clinical Master Plan that addresses the underlying dysfunction, typically through nutrition, lifestyle changes, and targeted support. Learn more about our gut health services and our overall approach.
If your symptoms also include fatigue, weight changes, or feeling cold, it may be worth reading what a complete thyroid and hormone panel includes. For an overview of how testing and care work at our clinic, see functional medicine in Westminster, CO.
Because gut health and immune health are closely linked, stool testing is also often part of the workup for people with autoimmune concerns.
When to see your medical doctor instead
A functional stool panel is not a substitute for medical screening. It does not replace a colonoscopy and it is not a cancer screening test. Contact your medical doctor promptly if you have blood in your stool, black or tarry stools, unexplained weight loss, severe or worsening abdominal pain, persistent vomiting, or a fever. If you have a medical emergency, call 911.
We work alongside patients’ existing medical providers, and many patients continue seeing their primary care doctor or specialist while working with us.
Frequently asked questions
Is a comprehensive stool test done at home?
Yes. You receive a collection kit, collect the sample at home following the included instructions, and ship it directly to the lab.
Can I do stool testing through telehealth?
Yes. Dr. Harrison’s Center of Functional Medicine offers telehealth visits, and patients come from across Colorado and beyond. Kits can be shipped to you, and results are reviewed during a virtual visit.
Does a stool test diagnose IBS or SIBO?
No single stool test diagnoses IBS or SIBO. A stool test can show patterns such as inflammation, poor digestion, or bacterial imbalance that help explain symptoms. SIBO is usually assessed with a separate breath test.
Where is your clinic located?
We are at 9035 Wadsworth Pkwy #3300, Westminster, CO 80021, and we see patients from Westminster, Arvada, Broomfield, Thornton, Northglenn, and the north Denver metro. Office hours are Monday through Thursday, 9am to 5pm. Call 720-449-6217.
How do I get started?
Every new patient starts with a free 15-minute discovery call, so you can ask questions and we can see whether we are a good fit. Book your free discovery call here.