The short answer
- Yes: the GI-MAP is a PCR test run on a stool sample.
- But: "stool PCR" in a clinic usually means a GI pathogen panel for acute diarrhoea — a different job.
- Culture is different again: it grows organisms; PCR detects genetic material.
- If you are acutely ill, you need a clinician now, not a 10-14 business day panel.
Which test do you need?
Work out which kind of test actually fits
Three questions. Sometimes the honest answer is that you need a clinician rather than anything we sell.
Answer the questions above. Without JavaScript: if you are acutely unwell, see a clinician now — a panel that returns in 10–14 business days cannot help. If symptoms are chronic and a workup has not explained them, a broad functional panel is a reasonable next question.
A guide to the right category of test, not medical advice. If in doubt, or if you are worried, speak to a clinician.
This question comes up constantly and it deserves a straight answer, because both possible answers are half right.
The GI-MAP (Gastrointestinal Microbial Assay Plus) is a stool test that uses PCR — specifically quantitative PCR, which reports how much of a target was detected rather than just whether it was. So if you are asking "does the GI-MAP use stool PCR", yes.
But when a gastroenterologist or an urgent-care clinician says "we sent a stool PCR", they usually mean something else: a gastrointestinal pathogen panel, a multiplex PCR test covering the common infectious causes of acute diarrhoea, run to find something treatable fast. Same underlying technology, different panel, different purpose, different timeline.
Three different tests people call "a stool test"
| Clinical GI pathogen panel | Stool culture | GI-MAP | |
|---|---|---|---|
| Main job | Find a treatable infectious cause of acute diarrhoea | Grow an organism, often to test what it is susceptible to | Characterise the gut broadly — pathogens plus flora, fungi and intestinal-health markers |
| Method | Multiplex PCR | Culture on selective media | Quantitative PCR (qPCR) |
| Result type | Usually detected / not detected | What grew, and often susceptibilities | A quantity per target, against a reference range |
| Typical turnaround | Hours to a couple of days | Several days | Approximately 10–14 business days from sample receipt |
| Who orders it | Your treating clinician, usually while you are unwell | Your treating clinician | A licensed practitioner — supplied as part of ordering here |
| Wrong tool when | You want a broad picture of flora and gut markers | You need an answer today | You are acutely ill and need an answer now |
PCR versus culture: the difference that matters
Culture grows the organism. That takes time and depends on the organism surviving collection and transport, but what you get at the end is a living isolate you can test drugs against.
PCR detects genetic material directly. It does not need the organism to survive transport and it can find targets that are difficult to culture, which is a real advantage. The trade-off is the thing worth understanding: detecting DNA tells you the genetic material is present, not that the organism is alive, and not that it is causing your symptoms. Plenty of organisms turn up in people who feel fine.
Neither method is simply better. They answer different questions, which is why clinicians sometimes use both.
When the GI-MAP is the wrong test
See a clinician now, not us, if you have severe or bloody diarrhoea, a high fever, signs of dehydration, severe abdominal pain, diarrhoea that started during or after a course of antibiotics, or symptoms after travel. Those situations need assessment on a timescale of hours, and a panel that returns in 10–14 business days cannot help you. We would rather lose the sale than have you wait.
When a broad functional panel makes sense
The GI-MAP is built for the other situation: symptoms that have gone on for months, a clinical workup that came back unremarkable, and a practitioner who wants a wider and quantified view than a targeted pathogen panel gives. Because it reports quantities across flora, fungi and intestinal-health markers as well as pathogens, it describes a broader picture — and because it describes rather than diagnoses, that picture needs interpreting.
What it is not is a shortcut past a clinician. See how results are reported and what a stool test structurally cannot show.
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