Bloating, IBS, Skin Issues, and Fatigue: The Gut Test You Need to Find the Root Cause
By Ella Davar, RD
Most people come to my practice after years of trying diets, supplements, and elimination protocols.
They’ve tried probiotics.
They’ve cut gluten.
They’ve tried low-FODMAP.
And yet they still experience symptoms like:
• chronic bloating
• IBS or irregular digestion
• unexplained fatigue
• acne or eczema
• food sensitivities
• brain fog
• immune issues
• stubborn inflammation
The reason this happens is simple. Most people are treating symptoms, not identifying the root cause. And in functional nutrition, the root cause often lives in the gut microbiome.
But here’s the key: Not all gut tests are created equal. That’s why in my practice, I rely on advanced diagnostics like the GI-MAP® stool test
Why Many Microbiome Tests Miss the Real Problem
Many microbiome tests provide broad microbiome trends — showing percentages of bacteria in the gut. While interesting, these results often don’t answer the question patients care about most:
“What exactly is causing my symptoms?” What we need in clinical practice is actionable data. Data that can identify:
• pathogens
• bacterial overgrowth
• parasites
• inflammatory markers
• digestive dysfunction
• immune activation
That’s why in my practice I use quantitative PCR stool testing, specifically the GI-MAP® test by Diagnostic Solutions
What Makes Quantitative PCR Testing Different
Quantitative PCR (qPCR) testing is a highly sensitive molecular diagnostic technology. Instead of estimating microbiome composition, qPCR can detect and quantify specific organisms and pathogenic bacteria.
This means we can identify:
• H. pylori infections
• parasite DNA
• pathogenic bacteria
• opportunistic microbes
• yeast overgrowth
• markers of intestinal inflammation
• digestive enzyme insufficiency
From a clinical perspective, this changes everything. Because instead of guessing, we can build a targeted protocol based on objective diagnostic markers.
Why H. pylori Virulence Factors Matter
One of the most important insights from advanced stool testing is the identification of H. pylori virulence factors. Many people carry H. pylori bacteria. But not all strains are equally harmful. Certain virulence markers — such as CagA and VacA genes — indicate strains that are associated with:
• chronic inflammation
• stomach lining damage
• increased ulcer risk
• long-term digestive complications
Identifying these markers allows practitioners to determine whether the infection is clinically significant and requires intervention. Without this information, treatment decisions are often based on incomplete data.
The Gut-Brain Connection
Another reason stool testing is so important is the gut-brain axis. The gut communicates directly with the nervous system through immune signaling, microbial metabolites, and inflammatory pathways.
This is why gut imbalances can show up as:
• anxiety
• brain fog
• fatigue
• mood swings
• sleep disturbances
In my work with the Gut-Brain Method™, we look at gut health not just as digestion — but as the foundation of metabolic, hormonal, and neurological health. Testing allows us to understand what is happening inside the microbiome before designing nutrition protocols.
Common Symptoms That Often Lead to Testing
Many patients who benefit from GI-MAP® testing present with symptoms such as:
• chronic bloating
• IBS or irregular bowel movements
• unexplained skin conditions
• autoimmune symptoms
• food sensitivities
• fatigue
• low immunity
• digestive discomfort after meals
These symptoms can often be connected to microbial imbalances or pathogenic infections that are difficult to identify without proper testing.
Why Diagnostic Markers Matter in Root-Cause Medicine
Functional medicine is built on a simple principle: Measure what matters. Instead of guessing which supplements or diets might work, diagnostics allow us to identify the exact biological drivers of symptoms.
This leads to:
• more precise nutrition strategies
• targeted antimicrobial protocols when necessary
• microbiome restoration
• improved digestive function
• reduced inflammation
And most importantly, better outcomes for patients. Ready to Understand Your Gut? If you’ve been struggling with ongoing symptoms and want real answers, this is where I recommend starting.
👉 Learn more about GI-MAP® testing and how to get started here
The Future of Gut Health
As microbiome science continues to evolve, the integration of advanced diagnostics with personalized nutrition will become the gold standard in preventative healthcare. In my clinical work and in the Gut-Brain Method™ practitioner training, we teach healthcare professionals how to interpret these markers and design protocols that address the underlying biology of disease. Because when you understand what’s happening in the gut, you can finally move beyond symptom management — and begin restoring true metabolic and digestive health.
