Gut microbiome test · At-home stool sample · UK clinic
Comprehensive Stool Test (GI-MAP) + Zonulin
The GI-MAP + Zonulin is an at-home stool test from a UK clinic that maps your gut microbiome and screens for pathogens, parasites and leaky gut. 88 markers from one sample, analysed by quantitative PCR. Ideal for persistent bloating, IBS, fatigue or skin flare-ups, especially when standard tests come back clear.
- Free UK delivery and prepaid return by DHL
- Results in 21 working days
Not sure if this is the right test for you? Book a free 15-minute Discovery Call with a registered practitioner.
What you receive
Your at-home test kit, laboratory analysis of your stool sample by quantitative PCR, plus lab report measuring 88 markers across ten groups, each one quantified and flagged against the lab’s reference ranges. View a sample lab report.
Delivery and turnaround
Free UK delivery and prepaid return, both by DHL courier. Kits are dispatched within 1 to 2 working days and delivered the next working day. Results ready approximately 21 working days from when the lab receives your sample. International delivery is available, with costs calculated at checkout.
What does the GI-MAP + Zonulin test for?
It tests for bacteria, H. pylori, parasites, fungi and viruses in your gut, checks digestion and inflammation, and measures zonulin, the marker of leaky gut. It is the gold-standard stool test in functional medicine, analysed by quantitative PCR, unlike consumer microbiome kits.
Digestion & inflammation
Shows you how well you are digesting and absorbing your food, and whether your gut is inflamed.
H. pylori
Tells you whether you carry the stomach bacterium linked to reflux, gastritis and ulcers, and, if so, how aggressive it is.
Pathogens, parasites & fungi
Checks whether an infection, a parasite or a yeast overgrowth is behind your symptoms.
Your gut microbiome
Shows you whether your gut bacteria are in balance, or whether an imbalance (dysbiosis) could explain your symptoms.
Zonulin
Tells you whether you have leaky gut (intestinal permeability), using zonulin, the key marker most gut tests cannot measure.
See all 88 markers, in ten groupsTap or click a group to see every marker in it
Bacterial pathogens
Bacteria that cause acute gut infection.
- C. difficile toxin A
- C. difficile toxin B
- Campylobacter
- E. coli EPEC/EHEC
- E. coli O157
- Enteroinvasive E. coli / Shigella
- Enterotoxigenic E. coli LT/ST
- Salmonella
- Shiga-like toxin E. coli stx1
- Shiga-like toxin E. coli stx2
- Vibrio cholerae
- Yersinia enterocolitica
Commensal / keystone bacteria
The beneficial bacteria a healthy gut depends on.
- Akkermansia muciniphila
- Bacteroides fragilis
- Bacteroidetes
- Bifidobacterium spp.
- Enterobacter spp.
- Enterococcus spp.
- Escherichia spp.
- Faecalibacterium prausnitzii
- Firmicutes
- Firmicutes : Bacteroidetes ratio
- Lactobacillus spp.
- Roseburia spp.
Digestion, immune & inflammation markers
Markers of digestive function, gut immune defence, gluten reactivity, inflammation and hidden blood in the stool.
- β-Glucuronidase
- Anti-gliadin IgA
- Calprotectin
- Elastase-1
- Eosinophil activation protein (EDN)
- Occult blood (FIT)
- Secretory IgA
- Steatocrit
Dysbiotic & overgrowth bacteria
Normally harmless bacteria that cause symptoms when they overgrow.
- Bacillus spp.
- Desulfovibrio spp.
- Enterococcus faecalis
- Enterococcus faecium
- Methanobacteriaceae
- Morganella spp.
- Pseudomonas aeruginosa
- Pseudomonas spp.
- Staphylococcus aureus
- Staphylococcus spp.
- Streptococcus spp.
Fungi, yeast & viruses
Candida and other yeasts and fungi, plus two viruses that affect immune function.
- Candida albicans
- Candida spp.
- Cytomegalovirus
- Epstein-Barr virus
- Geotrichum spp.
- Microsporidium spp.
- Rhodotorula spp.
H. pylori & virulence factors
The stomach bacterium associated with reflux, gastritis and ulcers, and its virulence genes.
- babA
- cagA
- dupA
- Helicobacter pylori
- iceA
- oipA
- vacA
- virB
- virD
Inflammatory & autoimmune-related bacteria
Bacteria associated with gut inflammation and autoimmune conditions.
- Citrobacter freundii
- Citrobacter spp.
- Enterobacter spp.
- Escherichia spp.
- Fusobacterium spp.
- Klebsiella pneumoniae
- Klebsiella spp.
- M. avium subsp. paratuberculosis
- Prevotella spp.
- Proteus mirabilis
- Proteus spp.
Intestinal permeability: zonulin
Zonulin regulates the tight junctions between the cells of your gut lining. A raised level is the recognised marker of increased intestinal permeability, or leaky gut, which is linked to food sensitivities, inflammation, and skin and autoimmune conditions. It is the marker that sets this test apart, and most gut tests cannot measure it.
- Zonulin
Parasites: protozoa & worms
Single-celled parasites such as Blastocystis and Dientamoeba, and intestinal worms including roundworm, hookworm, whipworm and tapeworm.
- Ancylostoma duodenale
- Ascaris lumbricoides
- Blastocystis hominis
- Chilomastix mesnili
- Cyclospora spp.
- Dientamoeba fragilis
- Endolimax nana
- Entamoeba coli
- Necator americanus
- Pentatrichomonas hominis
- Taenia spp.
- Trichuris trichiura
Parasitic & viral pathogens
Infectious parasites and viruses behind gastrointestinal illness.
- Adenovirus 40/41
- Cryptosporidium
- Entamoeba histolytica
- Giardia
- Norovirus GI/II
Who is the GI-MAP + Zonulin test for?
Anyone with persistent digestive symptoms such as bloating, IBS or reflux, suspected leaky gut, or skin, inflammatory and autoimmune conditions where the gut may play a part.
Acne, eczema, rashes
Often linked to: gut inflammation, dysbiosis and leaky gut.
This test measures: inflammatory bacteria, calprotectin and zonulin.
Anxiety & low mood
Often linked to: dysbiosis, inflammation and leaky gut, through the gut-brain axis.
This test measures: beneficial and overgrown bacteria, calprotectin and zonulin.
Bloating & gas
Often linked to: bacterial overgrowth, low digestive enzyme output or H. pylori.
This test measures: overgrowth and methane-producing bacteria, elastase for enzyme output, and H. pylori.
Brain fog
Often linked to: dysbiosis, leaky gut and inflammation, through the gut-brain axis.
This test measures: bacterial balance, zonulin and calprotectin.
Chronic fatigue
Often linked to: poor absorption, a chronic gut infection or a leaky, inflamed gut.
This test measures: elastase and steatocrit for digestion, pathogens and parasites, and zonulin.
Constipation
Often linked to: an imbalanced microbiome, low keystone bacteria and methane-producing overgrowth.
This test measures: keystone species such as Akkermansia, and Methanobacteriaceae.
Cramps & stomach pain
Often linked to: a gut infection, inflammation or H. pylori.
This test measures: bacterial, parasitic and viral pathogens, calprotectin for inflammation, and H. pylori.
Diarrhoea
Often linked to: an infection, a parasite or gut inflammation.
This test measures: salmonella, C. difficile, Giardia, Cryptosporidium, Blastocystis and more, plus calprotectin.
Headaches & migraines
Often linked to: gut permeability and an imbalanced microbiome.
This test measures: zonulin and the full bacterial map.
Heartburn
Often linked to: H. pylori, a common driver of reflux and gastritis.
This test measures: h. pylori and eight virulence factors, which show how aggressive the strain is.
IBS / IBD
Often linked to: overgrowth, a lingering infection or a post-infectious gut; IBD flares show as raised calprotectin.
This test measures: pathogens, parasites, overgrowth bacteria, and calprotectin.
Joint pain
Often linked to: leaky gut, and bacteria associated with inflammation and autoimmunity.
This test measures: zonulin, and Klebsiella, Proteus, Citrobacter and related species.
Poor sleep
Often linked to: gut imbalance and inflammation, both of which can disrupt sleep.
This test measures: the microbiome map and inflammation markers.
Thyroid & autoimmune
Often linked to: leaky gut, and bacteria associated with autoimmune conditions.
This test measures: zonulin, and the inflammatory and autoimmune-related bacteria group.
Weight struggles
Often linked to: low keystone bacteria such as Akkermansia, and overgrowth.
This test measures: keystone species, the Firmicutes to Bacteroidetes ratio, and overgrowth bacteria.
How does the at-home GI-MAP stool test work?
You collect a single sample at home with everything provided in the kit, and DHL collects it from your door.
Order online
Secure checkout. No clinic visit or GP referral required.
Your kit arrives by courier
Dispatched within 1 to 2 working days. Delivered next day by DHL.
Collect sample at home
One stool sample, following the instructions in the kit.
Return by prepaid courier
Book a free DHL collection online. Results ready in 21 working days.
How do I interpret my results?
Making sense of a lab report is the most important part of testing. Once your results are ready, your lab report is uploaded to your secure Client Folder. From there, you choose your level of support from our UK-registered nutritional therapist (optional, priced separately): a Lab Findings Review or a Comprehensive Consultation.
BSc, mBANT, CNHC, NLP Dip
Which consultation is right for me?
Understand your results with a Lab Findings Review, or go a step further and act on them with a Comprehensive Consultation.
Lab Findings Review
£99- Clinical analysis of your lab results
- What the findings mean for your symptoms and health
- Time for your questions
Comprehensive Consultation
£180- Everything in the Lab Findings Review
- In-depth review of your health history, diet and lifestyle (Health Questionnaire and Food & Symptoms Diary)
- A fully personalised nutrition & lifestyle action plan
What do our customers say?
“The GI-MAP with Zonulin gave me the deep answers standard medical tests missed. The home collection kit was straightforward, and shipping it back was easy. The results were incredibly detailed and insightful.”
Claire EVerified customerA year of bloating and brain fog, then a plan that worked
The GI Map plus Zonulin test uncovered a number of issues, from bacterial overgrowth to leaky gut. With real answers in hand, I was able to start a thoughtful, intentional protocol. I'm happy to say that after time and dedication to what she recommended, my symptoms are gone.
SamanthaVerified customerResults that explained years of severe eczema
It was a real eye opener as it confirmed what I was thinking for many months before the test, that I had a bad leaky gut. Me and Carmen then had a clear gameplan setup how to tackle healing my leaky gut and getting long lasting relief.
IshVerified customerRead all 10 reviews of this testWrite a review
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Frequently Asked Questions
Can I do the GI-MAP + Zonulin test at home in the UK?
Yes. It is an at-home stool test: you order online, the kit comes to your door, you collect one small sample at home and send it back with the prepaid return. No GP referral or clinic visit is needed. We deliver to any UK address, and international delivery is available at checkout.
Can the GI-MAP be used for children?
Yes. The GI-MAP is suitable for children from 2 years of age, where a more detailed assessment of gut health and the gut microbiome is appropriate. If you are unsure whether it is the right test for your child, book a free Discovery Call and a registered practitioner will help you decide.
What is the difference between the GI-MAP and the GI-MAP + Zonulin?
The GI-MAP + Zonulin includes every marker on the GI-MAP and adds zonulin, the marker of intestinal permeability (leaky gut). Choose the GI-MAP with zonulin when symptoms reach beyond the gut, such as skin flare-ups, fatigue or inflammatory and autoimmune conditions.
Is the GI-MAP test worth it if I don’t have digestive symptoms?
Yes. Leaky gut and gut imbalances often show up outside the gut, as fatigue, brain fog, skin problems, joint pain or autoimmune conditions. If your symptoms are ongoing and standard tests have come back clear or inconclusive, the GI-MAP looks where they do not.
How accurate is the GI-MAP test?
The GI-MAP is made by one laboratory, Diagnostic Solutions Laboratory, and analysed by quantitative PCR (qPCR), which detects the DNA of each organism and measures how much is present. That measurement is what lets a practitioner tell a trace from an active infection, and it is the difference between a clinical test and a standard consumer microbiome kit, which uses sequencing to report relative abundance. If a test is not from Diagnostic Solutions Laboratory, it is not the GI-MAP. Like any lab test, the report is a snapshot, which is why a practitioner reads it against your symptoms and history.
Can I get the GI-MAP test on the NHS?
No. The NHS does not offer the GI-MAP or comprehensive gut microbiome testing; NHS stool tests look for specific infections or blood. The GI-MAP is a private test ordered through a clinic. The price covers the kit, the lab analysis and your lab report; having the report interpreted is a separate, optional consultation.
When should I collect my sample?
On a Sunday or Monday. The sample must be shipped within 24 hours of collection and DHL does not collect at weekends, so collect on Sunday or Monday and book your free DHL collection for the next day. Keep the packed envelope in the fridge until the driver arrives. Full instructions are in the kit.
What should I be aware of before collecting my sample?
Your kit includes full collection instructions. To make your sample as representative as possible, please note the following before you collect it.
- Allow at least 2 weeks after finishing a course of antibiotics, antifungals, antiparasitic treatments or other antimicrobial protocols.
- Stop probiotic supplements 2 weeks before collection.
- Stop non-essential prebiotics and other gut-support supplements 7 days before collection.
- Stop digestive enzymes, betaine HCl, antacids, activated charcoal and bentonite clay 3 days before collection.
- If you have recently had a colonoscopy or barium enema, wait at least 4 weeks.
- Do not collect during menstruation or while you have active bleeding from haemorrhoids.
- If constipation makes collection difficult, contact us for advice before using laxatives, enemas or suppositories.
Never stop prescribed medication without first consulting your doctor or prescriber. If you take a proton pump inhibitor (PPI) or another prescribed medication that may affect the gut environment, or you are unsure whether anything you take could affect your results, contact us before collecting your sample and we will advise you.
Can someone help me interpret my GI-MAP results, even if I tested elsewhere?
Yes. Book a Lab Findings Review with us and a registered nutritional therapist will take you through every marker against your symptoms and history, whether you tested with us or elsewhere; bring your report to the session. If you then want a personalised plan, that is the Comprehensive Consultation.
10 reviews for Comprehensive Stool Test (GI MAP) Plus Zonulin
Adam verified customer
This test was the first port of call for me working with Carmen. Most things start with the gut so this seemed like a good place to start. The test is very easy and straightforward and results are sent out in a matter of weeks. Carmen will carefully go over your results with you explaining what it all means, what areas require support and what the next steps are.
zara verified customer
After years of struggling with my GI health and an initial consultation with Carmen, she advised me to do the GI-map plus Zonulin test to understand what was really going on. This was a crucial first step for returning me to full health. The kit arrived quickly, was easy to follow instructions and Carmen was always there with an informative and fast reply if I had queries. After receiving the test results, Carmen explained everything thoroughly and proposed an organised plan to move forward. I am very happy with the test and continued support from Nutrition Diets clinic. Would definitely recommend it. Thank you 🙂
Aisha verified customer
I was unable to digest anything when I first met Carmen but using this GI MAP test she identified what was wrong (her findings were confirmed later by intensive testing by a gastroenterologist). I can’t recommend working with her more.
Corinne verified customer
Carmen (much respected and trusted by us) has treated both myself and my daughter over the years producing brilliant results.
Following an initial consultation, she recommended the Comprehensive Stool Test (GI MAP) Plus Zonulin for my then 19 year old daughter who was suffering digestive issues, constipation, mood and hormone imbalance with irregular and absent periods. The test is an investment well worth making, it takes away the guessing and gives clear answers to enable an informed decision as to the best treatment plan.
Arriving by courier and easy to do at home, sent back to the lab by courier with really clear instructions and support from Carmen throughout this process. Very in depth and looks at such things as pathogens, bacteria, opportunistic/overgrowth microbes, fungi/yeast, viruses, parasites and intestinal health markers. A five page Lab Results report enabled Carmen to work her functional medicine brilliance, seeing exactly what was going on in the gut as a clear starting point. We then had a follow up consultation with her to make a treatment plan going forward. First repairing the Leaky Gut Lining, and then moving on in phases to balancing gut microbiome/diversity and balancing hormones. Highly recommend.