Your gut is home to trillions of microbes, and they're not just along for the ride. They digest what you can't, make vitamins, train your immune system and talk to your brain [1,2]. When that community is balanced, you barely notice it. When it isn't, the effects can show up well beyond the gut.
A microbiome test is how you actually see that community, rather than guess at it. Here's what that looks like in practice.
What a test can tell you
- How diverse and balanced your gut is - the overall shape of the community, not just a handful of headline bugs.
- Whether your key "keystone" microbes are pulling their weight - the specialists behind digestion, your gut barrier and a calm gut environment.
- What your microbes are producing - including short-chain fatty acids like butyrate, a major fuel source for your gut lining [2,5].
- Whether anything's out of place - inflammation markers, gut-barrier issues, or unwanted guests like parasites and yeast overgrowth [4].
It's an insight tool, not a diagnosis. Dysbiosis (an imbalanced gut) is associated with a wide range of symptoms and conditions, but associated with isn't the same as caused by - a test describes your gut, it doesn't diagnose what's wrong with you [3].
Three tests, three different jobs
i-screen offers three at-home stool tests, and the difference comes down to lab method [6].
A quick note on terms first: current international consensus reserves "microbiome profiling" for broader sequencing methods, like the one Microbiomics uses below. Culture-based and PCR-based panels (Microbiome Check and GI-MAP) are more accurately described as targeted detection of specific organisms and markers, even though they're commonly sold as "microbiome tests" [3]. That doesn't make them less useful, it just means they're answering a narrower question than a full community profile.
Microbiome Check grows your microbes and identifies them by their molecular fingerprint (culture + MALDI-TOF). A solid, affordable first look at beneficial versus unwanted organisms, plus basic digestive clues. 78 markers, ~2 weeks, around $239.
Complete Microbiome Mapping (GI-MAP) uses DNA-based PCR to detect a wider, targeted list of organisms, plus inflammation, gut-barrier and short-chain fatty acid markers. Suits ongoing or unresolved symptoms. 134 markers, ~2 weeks, around $569.
Microbiomics Advanced Gut Test sequences all the DNA in your sample (metagenomic shotgun sequencing) for the deepest view of the three, including diversity indices and functional insight into what your microbiome is producing. 187 markers, ~2 weeks, around $599.
All three are non-invasive, ordered online with no GP referral, and analysed in a NATA-accredited lab.
Before you order, know this
A microbiome test is the right next step for general digestive symptoms, low energy, skin or mood changes, or just curiosity. It is not the right first step if you have any of the following - see your GP promptly instead [7]:
- Blood in your stool, or black, tarry stools
- Unexplained weight loss
- A persistent, unexplained change in bowel habits
- Ongoing or severe diarrhoea, or signs of dehydration
- Fever alongside gut symptoms
- A family history of bowel cancer or inflammatory bowel disease, or you're 45 or older - the age from which Australia's National Bowel Cancer Screening Program recommends screening [8]
Want the full picture?
Keystone species, short-chain fatty acids, leaky gut markers, how to prep for your test and how to read your results - it's all in our full guide to microbiome testing (link TBC - point to wherever the full guide sits under Resources).
Frequently asked questions
Do I need symptoms to test? No. Some people test because of ongoing digestive symptoms; others are just curious or want a baseline. Either is fine, but see your GP too if you have symptoms that concern you.
Will the test tell me exactly what to eat? Not by itself. It gives insight into your gut community, which - combined with your goals and a practitioner's input - can help guide personalised choices. It isn't a meal plan.
How often should I test? There's no set schedule. Many people test once for a baseline and again later if they've made changes and want to see whether things have shifted - a practitioner can help you decide what timing suits you.
What if a pathogen or parasite shows up? Some findings need medical follow-up, and certain infections are notifiable to public health authorities by the lab [9]. If something like this shows up, we'll point you toward next steps, and you should see your GP.
Can this replace advice from my doctor? No. It's an insight tool that complements medical care, not a replacement for it. Always see your doctor for symptoms that need evaluation.
This information is not intended to be a substitute for professional medical advice. i-screen provides wellness and educational testing services only and does not diagnose, treat, cure or prevent any disease or medical condition. Always discuss your results with your doctor or another qualified health professional.
