Clinical-grade gut analysis. At home.

An at-home stool DNA sequencing analysis that maps your gut microbiome composition and function, and delivers personalised insights on digestion, immunity, mood and metabolism, with actionable recommendations from our clinical team.

2 – 3 weeks

Stool sample

Shotgun Metagenomic NGS

Order test

From sample to insight, in four simple steps.

Order your kit

Free UK delivery in 2–3 working days. Discreet packaging.

Collect at home

A small stool sample using the sterile kit, with step-by-step instructions.

Lab analysis

Shotgun metagenomic sequencing in our accredited lab. Results in 2–3 weeks.

Report + Consultation

Personalised report in the Phenome app, plus a 1-to-1 nutritionist session.

Gut microbiome testing: Why it matters for digestive health.

The gut microbiome is a central regulator of human health, influencing digestion, immune function, metabolism, energy levels and brain–gut signalling linked to mood and cognitive clarity.

When balanced, these systems function optimally. When disrupted, a state called microbial dysbiosis, measurable imbalances can affect multiple aspects of daily health.

100T+

Microorganisms

Hosted in your gut

3M+

Microbial genes

vs 20,000 in human DNA

70%

Immune system

Located in the gut

40+

Disorders

Linked to gut imbalance

This test is highly recommended for…

For everyday gut health optimisation

• Improve digestion and energy
• Understand how your gut affects mood
• Get science-backed insights and nutrition tips

For those with gut-related symptoms

• Bloating, IBS symptoms, post-meal discomfort
• Breakouts, eczema, skin inflammation
• Fatigue, brain fog, persistently low energy
• Frequent illness or low immunity

For fitness, recovery & performance

• Optimise diet, supplements and probiotics
• Enhance recovery and nutrient absorption
• Improve performance through gut optimisation

For long-term preventive health

• Prevent chronic conditions before they develop
• Family history of metabolic or autoimmune disorders
• Proactive, data-driven health management

What are the symptoms and conditions caused by gut microbiome imbalance?

Microbial dysbiosis can show up in surprising places, across the digestive system, skin, immunity, mood and energy. If any of these feel familiar, testing can help you understand why.

IBS & constipation

Food intolerances

Bloating & indigestion

Acne & eczema

Fatigue & brain fog

Anxiety & mood imbalances

Weight fluctuations

Low immunity & inflammation

What Is Included in Your Gut Microbiome Test Report

Your Gut Microbiome Test Report provides a detailed analysis of your gut bacteria, diversity, and metabolic performance. It translates scientific data into clear insights that reveal how your gut health affects digestion, immunity, and energy. Each section of your report can be expanded for a full explanation of your results.

Gut Microbiome Report cover with DNA double helix design on a blue background, featuring Phenome Longevity logo.
Overview Summary

An overview of your gut microbiome diversity, stability and health score, with a visual comparison to optimal reference ranges.

Microbial Composition

A detailed breakdown of the dominant bacterial species in your gut, showing which are beneficial and which may contribute to imbalance.

Enterotype

Identification of your gut type based on dominant bacterial families. This reveals how your microbiome influences metabolism and dietary response.

Dysbiosis Index

A numerical measure of imbalance in your gut ecosystem, how far your microbiome has shifted from equilibrium and what this means for you.

Complete List of Bacteria

A full list of bacterial species found in your sample with their known roles in digestion, immunity and metabolism.

Metabolic Potential

An overview of your microbiome’s ability to process carbohydrates, fats and proteins and produce short-chain fatty acids that nourish your gut lining.

Nutrient Biosynthesis and Breakdown

Analysis of how your bacteria contribute to vitamin production such as B12, K and folate, and how efficiently they process key nutrients.

Gut Immune Axis

Evaluation of how your gut microbes interact with your immune system to regulate inflammation and protect against pathogens.

Gut Skin Axis

Insights into how the state of your gut affects skin health and the link between microbial imbalance and conditions such as acne or eczema.

Inflammatory Potential

Analysis of bacteria linked to inflammation control and immune overactivity, helping you identify early signs of imbalance.

Leaky Gut Syndrome

Assessment of microbial activity related to gut barrier integrity and permeability that can influence systemic inflammation.

Irritable Bowel Syndrome (IBS)

Evaluation of microbial markers associated with IBS, showing patterns linked to discomfort, bloating and irregular digestion.

Small Intestinal Bacterial Overgrowth (SIBO)

Detection of bacterial profiles associated with overgrowth in the small intestine that may cause bloating, gas and nutrient absorption issues.

Gluten Sensitivity

Exploration of microbial pathways involved in gluten metabolism, identifying patterns that may indicate sensitivity or intolerance.

Weight Management

Analysis of bacteria influencing metabolism, energy extraction and fat regulation to understand how your gut may affect weight control.

Personalised Recommendations

Targeted lifestyle and nutrition guidance based on your microbiome profile, practical steps to restore balance and maintain long-term gut health.

Your personalised gut health report.

Full results in the Phenome app

All 16 report sections visualised clearly. Plain-language explanations for every finding, designed for people, not researchers.

Personalised diet & supplement guidance

After your results are ready, you’ll be connected with a Phenome nutritionist for a 1-to-1 session to go over your findings and build a plan around your microbiome.

Bacteria dictionary

Every significant species detected in your sample explained: its role in your gut, whether it’s protective or harmful, and what your levels mean for your health.

Complete data privacy

Your microbiome data is processed under GDPR, stored on encrypted servers, and never shared with any third party. You remain in full control.

The species in your report. Explained.

Your report includes the most important bacterial species and their role in gut function, digestion, immunity and metabolism.

Digestive and Metabolic Support

Immunity & Protection

Gut-Brain & Mood

Potentially Harmful

Digestive and Metabolic Support

Bifidobacterium longum

Supports digestion, reduces inflammation, and helps maintain gut barrier integrity.

Lactobacillus rhamnosus

Assists in breaking down carbohydrates and supports healthy intestinal flora.

Akkermansia muciniphila

Strengthens the gut lining and supports metabolic balance.

Faecalibacterium prausnitzii

Produces butyrate, an anti-inflammatory compound essential for colon health.

Roseburia intestinalis

Helps generate short-chain fatty acids and supports energy metabolism.

Immunity & Protection

Ruminococcus bromii

Assists in fermenting resistant starch and regulates immune balance.

Eubacterium rectale

One of the main butyrate producers, promoting anti-inflammatory activity.

Coprococcus eutactus

Supports mucosal immunity and reduces inflammatory stress.

Blautia obeum

Contributes to stability within the gut ecosystem and supports recovery after imbalance.

Anaerostipes hadrus

Associated with healthy fat metabolism and reduced inflammation.

Gut-Brain & Mood

Bacteroides uniformis

Plays a role in metabolite production linked to mood regulation and immunity.

Prevotella copri

Associated with dietary fibre metabolism and serotonin pathway balance.

Clostridium butyricum

Improves gut–brain signalling and supports emotional resilience through butyrate production.

Parabacteroides distasonis

Helps modulate immune response and stress-related pathways.

Potentially Harmful

Escherichia coli (pathogenic strains)

Can trigger gut inflammation and digestive discomfort when overgrown.

Clostridium difficile

Associated with toxin production and inflammation following antibiotic use.

Desulfovibrio piger

Linked to excess hydrogen sulphide production and gut irritation.

What our customers say.

"I honestly did this out of curiosity, but the results were shocking. I could finally see why I kept having random breakouts and sugar cravings. It’s strange how much your gut controls without you knowing. I’ve started taking care of it differently since."
— Michael T, 41Gut Microbiome Test
"I honestly did this out of curiosity, but the results were shocking. I could finally see why I kept having random breakouts and sugar cravings. It’s strange how much your gut controls without you knowing. I’ve started taking care of it differently since."
— Michael T, 41Gut Microbiome Test
"I always thought feeling heavy after meals was just normal for me. Turns out, my gut wasn’t in great shape. After seeing what was really going on, I started paying attention to what actually works for my body. I feel more in tune now, and my stomach finally feels calm again."
— Sara L, 36Gut Microbiome Test

Grounded in gut microbiome research.

The gut microbiome is one of the fastest-moving areas of biomedical science. Our analysis is built on peer-reviewed evidence across digestion, immunity and systemic health, reviewed by a clinician on our team, with methods, references and confidence intervals shipped in every report.

Peer-reviewed methodology

Cell Press, Nature, Gut

Accredited UK laboratory

ISO 15189 medical testing

Clinician-reviewed reports

1-to-1 nutritionist included

Quantifying diet-induced metabolic changes of the human gut microbiome

Read the paper

An atlas of human metabolism

Read the paper

Common questions

What does the Gut Microbiome Test analyse?

The test analyses the composition and balance of the gut microbiome in individuals, identifying key bacterial species, diversity levels, and patterns associated with digestion, immunity, metabolism and overall wellbeing.

Why is gut health important?

Your gut microbiome affects nutrient absorption, hormone balance, immune function, and even mood. Understanding its composition helps you make dietary and lifestyle changes that support long term health.

How is the sample collected?

The test requires a small stool sample, which can be collected easily at home using the sterile kit provided. Detailed instructions are included for safe and hygienic collection.

What insights will I receive in the report?

Your report includes an overview of bacterial diversity, abundance, and balance, along with findings related to digestion, inflammation, and microbial composition. It also provides personalised lifestyle and dietary recommendations.

How accurate is the analysis?

The test uses advanced shotgun metagenomic sequencing for high depth and precision. This method identifies bacteria at both the genus and species level for more accurate insights.

Who should take this test?

It is ideal for anyone over 18 who wants to learn more about their gut health. It's especially recommended if you're experiencing digestive discomfort, low energy, bloating, or irregular bowel habits.

When should I take and send my sample?

Please collect your sample between Monday and Thursday (Royal Mail). Be sure to return it on the same day using the prepaid return envelope, ideally before midday. Avoid collecting your sample on or near public holidays to prevent delays.

Where can I see my results?

Your results will be automatically uploaded to your secure profile on our app, created using the email address you provided at checkout. You’ll also receive an email notification with a direct link to view your results. Through the app, you can explore your full report and even download it as a PDF whenever you like.

Didn’t find your answer?

Don't hesitate to contact us. Our clinical team usually replies within one working day.

Your gut is the foundation of your health.

Test your gut health at home with lab-grade analysis and get fast, accurate results in 2–3 weeks.

Free UK shipping

Delivered in 2–3 working days

16 health domains

Mapped from a single sample

1-to-1 consultation

Phenome nutritionist included

GDPR + encrypted

Your data, always under your control