Gut health · 6 min read
“Should I do a gut test? Which one is best? Will it explain my symptoms?” We hear these questions every week. The honest answer: gut microbiome testing can be powerful, but only when it’s used correctly.
Wondering if a gut test is right for you? Book a free 15-minute microbiome test call with Dr Margarita.
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What does a gut microbiome test actually measure?
A gut microbiome test analyses a stool sample, usually collected over one to three days. Depending on the test, it can look at:
- Bacteria
- Fungi and yeast
- Parasites
- How well food is digested and absorbed
- Inflammation and immune activity in the gut lining
NHS testing asks: “Is there a disease?” Functional testing asks: “Why are the symptoms happening in the first place?”
That is where microbiome testing becomes useful. As a UK-trained GP with advanced training in functional medicine, I see the value of both.
How we judge a gut test
People often compare brands. Clinically, the value of a test isn’t in its name, but in what it tells us and what we can do with it.
01
Accuracy
Can we trust that the result reflects what’s really happening in your gut?
02
Clinical relevance
Does it help explain your symptoms, or is it interesting but not useful?
03
Actionability
Can we use it to build a clear, personalised plan? Most tests give data. Very few give direction.
The leading gut tests in the UK
Often our first choice
GI Effects® (Genova Diagnostics)
Measures: digestion and absorption, inflammation (including calprotectin), gut immune function, key gut bacteria, pathogens and parasites.
Best for: bloating, IBS-type or mixed symptoms, ongoing symptoms despite “normal” NHS tests, and complex health issues.
Good to know: it targets key organisms rather than mapping the whole microbiome, and needs expert interpretation.
Targeted
GI-MAP® (Diagnostic Solutions)
Measures: pathogens including H. pylori, parasites, viruses, yeast and key bacteria, using sensitive DNA testing.
Best for: a suspected specific infection, or symptoms that haven’t responded to treatment.
Good to know: not usually a first test, and it gives less insight into overall gut function.
All-round
GI360™ (Doctor’s Data)
Measures: microbial balance, pathogens, digestion and inflammation markers, and short-chain fatty acids.
Best for: a combined overview of the microbiome and gut function.
Good to know: a solid test, though we usually favour GI Effects® for its clearer clinical picture.
UK laboratory
Invivo gut health tests
Measures: microbial balance, opportunistic bacteria, yeast, parasites and selected gut markers.
Best for: mild to moderate symptoms, or when a UK-processed test is preferred.
Good to know: less detail than GI Effects® or GI-MAP®.
Consumer kits
ZOE, Atlas Biomed, GetTested
Measures: microbial diversity and broad patterns, often with diet guidance.
Best for: general interest and motivation to improve your diet.
Good to know: results vary between companies and rarely give enough depth to guide treatment for persistent symptoms.
The real risk of gut testing
Done well, gut testing can be incredibly helpful. Done poorly, it can lead to confusion, overwhelm, unnecessary supplements, or a treatment that misses the real issue.
Data without context is not clarity. It’s noise.
There is no single “best” gut test, only the right test for the right person at the right time. The real value lies not in the test itself, but in the clinical insight and the clear, personalised plan that follows.
Related reading: Gut dysbiosis · SIBO explained · Bloating SOS
Frequently asked questions
Do I need a gut test?
Not always. Testing is most useful when symptoms are ongoing, complex or unexplained by standard tests. On a free microbiome test call we’ll tell you honestly whether a test would help.
Which gut test is best?
There is no single best test, only the right test for the right person at the right time. GI Effects® is often our starting point because it gives a broad picture of how the gut is working.
How is this different from an NHS stool test?
NHS stool tests mainly look for disease, such as infection or inflammation. Functional gut testing also looks at digestion, gut immune activity and microbial balance, to help explain why symptoms are happening.
How much does testing cost?
Comprehensive stool testing such as GI Effects® starts from £385. We’ll only suggest a test if it would change your plan.
Do I need a GP referral?
No. You can book a free microbiome test call directly, or message us on WhatsApp first.
Not sure which test is right for you?
Book a free 15-minute microbiome test call. We’ll talk through your symptoms and tell you honestly whether testing would help, and which test makes sense.
Prefer a wider conversation about your health? Book a free Discovery Call.
Written and reviewed by Dr Margarita Kitova-John, GP (MRCGP) and functional medicine doctor · Lantern Clinic
This article is for general information and is not a diagnosis. If you have bleeding from your bottom, unexplained weight loss or a persistent change in bowel habit, please see your GP promptly.
