We run the GI Map on patients with skin conditions, autoimmune diagnoses, fatigue, chronic pain, hormonal disruption, and yes, gut symptoms. Not because we assume every patient has an infection, but because a conventional workup almost never tells you what's actually in there.
The gut microbiome drives immune function, hormone metabolism, skin barrier integrity, and the neurotransmitter production that shapes brain chemistry and mood. When those systems are failing, the gut is often where the root cause lives, even when the chief complaint has nothing to do with digestion.
Standard GI testing doesn't show you much of this. That's the problem.
What Standard Testing Misses
Standard stool cultures look for a short list of bacterial pathogens: Salmonella, Shigella, E. coli O157, Campylobacter. They use culture methods that require organisms to grow in a lab environment. Many gut organisms don't grow well in culture. The result is a test that catches acute food poisoning and misses most of what's making people chronically sick.
The GI Map uses quantitative PCR, which is DNA-based detection. It identifies organisms whether they can grow in culture or not, at much lower quantities than standard cultures require, and it tells you not just whether something is present but how much of it is there. One sample, and you're looking at an order of magnitude more clinical information than any standard stool panel gives you.
What It Shows
H. pylori
H. pylori is usually the first marker we look at. It's present in roughly 40% of the U.S. population, most of whom don't know it, and conventional GI workups often miss it unless there's an ulcer or a frank stomach complaint driving the workup. The GI Map detects H. pylori and its virulence factors. Not all strains are the same. Those carrying VacA or CagA virulence genes are more aggressive: associated with ulcers, gastric cancer, and more severe mucosal damage. Knowing which strain is present changes how urgently we treat it and what we're watching for over time.
Parasites
Parasites are chronically underdiagnosed by conventional testing. The GI Map detects Giardia, Cryptosporidium, Blastocystis hominis, Dientamoeba fragilis, and others. Blastocystis and Dientamoeba are commensal in some people and pathogenic in others, and they're frequently missed entirely on standard labs. We've had patients with years of IBS diagnoses get a positive Blastocystis on GI Map, clear it with targeted treatment, and watch their symptoms resolve. That's not guaranteed for everyone, but it shifts the question from "why does everything make you bloated" to "let's find out what's in there."
Bacteria and the Microbiome
Opportunistic bacteria (the ones that live in us but cause problems when overgrown) are quantified against reference ranges. Klebsiella, Proteus, and Citrobacter frequently correlate with bloating, motility problems, and immune activation. The gut also needs certain keystone species present in adequate amounts. Akkermansia muciniphila supports the mucosal lining. Faecalibacterium prausnitzii produces butyrate and has direct anti-inflammatory effects. Bifidobacterium supports immune regulation and barrier integrity. When these are low, the ecosystem becomes reactive, and immune dysregulation follows.
Candida
Candida shows up on the GI Map. It's real and it's treatable. It's also not the explanation for every chronic symptom the wellness space makes it out to be. What we actually see is Candida overgrowth correlating consistently with high sugar intake, prior antibiotic use, and immune suppression. Treat what's there. Don't go looking for it everywhere.
The Functional Markers
These are the ones most people don't think to ask about.
Elastase measures pancreatic enzyme output. Low elastase means protein and fat aren't being broken down properly, so nutrients aren't being absorbed regardless of how clean the diet is. You can eat perfectly and still not absorb it. We see this in patients with chronic stress, gallbladder history, or years of processed food eating. It's a fixable problem once you know it's there.
Steatocrit measures fat in the stool, another angle on fat absorption. When both steatocrit and elastase are off, the pattern points toward pancreatic function and bile production. When only one is off, the investigation goes a different direction.
Calprotectin is an inflammatory marker from white blood cells in the gut. Elevated calprotectin can indicate active inflammatory bowel disease and needs proper GI follow-up, including possible colonoscopy. The GI Map doesn't replace that workup. It adds context and helps make sure nothing slips through the gap between what a colonoscopy checks and what a functional stool test checks.
Secretory IgA is the gut's first-line immune defense. Low SIgA means the gut is poorly defended: more vulnerable to infection, more reactive to food proteins, more prone to permeability problems over time. High SIgA means something is actively triggering an immune response. Either direction tells us something useful.
A note on positive findings
A positive finding on a GI Map doesn't automatically mean we treat it. Context matters. A low-level Blastocystis in a patient with no symptoms and strong SIgA is different from the same organism in someone with chronic diarrhea, joint pain, and tanked immune markers. We're looking at the whole picture, not just circling every out-of-range value and writing a prescription.
The Gut-Hormone Connection
Beta-glucuronidase is a bacterial enzyme that deconjugates estrogen in the intestines. The liver packages estrogen for excretion. Beta-glucuronidase unpacks it and puts it back into circulation instead. Elevated beta-glucuronidase means more recycled estrogen, which means a higher overall estrogen load. This is directly relevant to patients with estrogen dominance, endometriosis, fibroids, PMS, or a family history of hormone-sensitive cancers. It's a bacterial problem with a hormonal consequence, and it shows up on a stool test.
We run the GI Map on nearly every patient with a hormone complaint. Gut dysfunction drives hormonal dysfunction. Treating the hormones without addressing the gut is often why patients plateau.
Who Gets This Test
Gut symptoms are the obvious indication, but they're far from the only one. Chronic fatigue, skin conditions that don't respond to topical treatment, autoimmune diagnoses, depression and anxiety that haven't shifted with conventional treatment, thyroid dysfunction, PCOS, endometriosis, persistent weight issues. All of these have documented connections to gut health and microbiome composition.
The patients I find this most useful for are the ones who've had "normal" GI workups and are still sick. A normal colonoscopy rules out cancer and obvious structural disease. It tells you nothing about the microbiome, your digestive capacity, your immune defenses, or whether you're carrying a parasite that's been quietly driving inflammation for years.
When the functional picture is missing, treatment is a guess. The GI Map gives you the data to stop guessing.