What an Organic Acids Test report shows, and what it can’t
An Organic Acids Test (OAT) measures what is left over in a urine sample when your body and gut microbes break down food, nutrients and neurotransmitters. It can add context when symptoms span energy, mood and digestion. It can’t tell you what condition you have, and some of what it picks up is simply what you ate and drank in the days before.
Bloods came back normal and you still feel flat by 2pm? Wanting a test that looks further makes complete sense.
Written and reviewed by Georgina Waugh, Clinical Nutritionist. Updated 13 September 2026.
General information, not medical advice. An Organic Acids Test does not diagnose any condition, and fatigue that lasts or keeps getting worse belongs with your GP first.
The short version
- An OAT measures organic acids, by-products of breaking down food, nutrients and neurotransmitters and of gut microbes, in one spot urine sample.
- In specialist labs, urine organic acid analysis is a first-tier test for inherited metabolic disorders. Reading it for nutrient needs has far less evidence behind it.
- Some markers track what you recently ate or drank: DHPPA with whole grains, tartaric acid with wine, hippuric acid with fruit and vegetables. The lab lists the first two as microbial and yeast markers.
- A flagged marker is a reason to look closer, not an answer on its own, and it does not tell you which supplement to take.
- It earns its place after the ordinary checks, when symptoms cross several systems and the answer would change what you do next.
What an organic acids test shows
You collect a single urine sample at home, a spot sample rather than a 24-hour collection, and send it back. The lab measures organic acids: small compounds that show up as your body processes food, nutrients and neurotransmitters, and that gut microbes make as well.
On the lab’s sample report, every result is reported against creatinine, which corrects for how concentrated or dilute the urine was, and set beside a reference limit on a bar. Most limits are an upper cut-off, so a result is either inside it or flagged.
Each group of markers can add something, and each has a limit:
| Marker group | What it can add | What it can’t do |
|---|---|---|
| Energy, fat and carbohydrate markers | Compounds from the pathways cells use to turn food into energy, such as the citric acid cycle. | Tell you why you are tired. What you ate, the supplements you took and how concentrated the sample was all move these numbers. |
| B vitamin markers | Compounds such as methylmalonic acid (MMA), which builds up when vitamin B12 is low. | Stand in for a B12 blood test. In blood, MMA also rises when kidney function is reduced. |
| Neurotransmitter by-products | What is left over as the body breaks down chemical messengers such as dopamine and serotonin. | Measure what is happening in your brain, or explain your mood on its own. |
| Oxidative stress and detoxification markers | Groups the lab labels oxidative damage, antioxidant demand and detoxification. | Show that you are “toxic” or need a detox. Organic acids in urine can also come from medicines and supplements. |
| Microbial markers | By-products that bacteria and yeasts can make, found in urine. | Map your gut. Some come from food as well, which the next section explains. |
The test we offer is run by NutriPATH, an Australian pathology lab. The options, including having your report read with a clinical nutritionist, are on our Organic Acids Test page.
Where the test comes from, and where the evidence thins
Urine organic acid analysis is not new or fringe. The American College of Medical Genetics and Genomics describes it as a crucial first-tier laboratory test for a broad range of inborn errors of metabolism: rare inherited conditions where a blocked pathway makes one compound pile up to very high levels.
A functional OAT uses the same kind of chemistry for a different question. Instead of looking for a dramatic pile-up, it reads small shifts across many markers as clues about energy, nutrients and the gut. That reading has far less research behind it than the diagnostic use.
A 2019 review in the Annals of Clinical Biochemistry looked at laboratory tests commonly used in complementary medicine in Australia, the United Kingdom and the United States. It warned that some are established tests used for purposes they were never validated for, and that their interpretations can be used to justify unnecessary treatment. That is the honest frame for any functional test, including this one.
Why one result can mislead
Organic acids in urine do not only come from your own metabolism. They can also come from medicines and dietary supplements, and several markers on an OAT are also studied as signs of what someone recently ate or drank:
- DHPPA, listed under microbial overgrowth on the lab’s sample report, has been studied as a marker of whole-grain intake.
- Tartaric acid appears on the same report among the yeast and fungal markers, described as Candida-related. It comes mainly from grapes, and researchers use it as a short-term marker of wine intake, over several days to a week.
- Hippuric acid has emerged as a potential marker of polyphenol-rich foods, especially fruit and vegetables.
So a flag can mean a pathway worth looking at, or a bowl of muesli and a glass of red. The report alone can’t tell you which. The sample report shows its reference limits without saying how they were set, which is one more reason a single number should never carry a decision on its own.
If you ever repeat the test, use the same lab and keep the days before collection as similar as you can, so you are comparing like with like.
When an OAT is the wrong first step
See your GP first if any of these apply
- fatigue that has lasted more than two weeks and is not getting better
- tiredness that is worrying you or stopping you from doing things
- fatigue that comes with other symptoms, such as weight loss
This is Healthdirect’s advice on fatigue. If you need urgent medical help, call triple zero (000).
An OAT also answers a different question from the other tests people weigh it against, so it helps to know which question is yours:
| If your main question is | A more useful place to start |
|---|---|
| Could this be low iron, low B12, my thyroid or something medical? | Your GP. Ordinary blood tests answer these directly, and they come before any functional test. |
| Is my bloating coming from bacteria in the small intestine? | A breath test, not a urine test. Our guide to what SIBO is explains it. |
| What does my gut community actually look like? | A stool test. Our guide to what a gut microbiome test can and can’t show covers it; an OAT’s microbial markers are by-products in urine, not a map. |
| I want a broad picture of nutrient status in blood and urine. | The Complete Nutritional Blueprint, which measures nutrients, fatty acids and hormones directly. |
| My symptoms cross energy, gut and mood, and the basics are done. | This is where an Organic Acids Test can add context. |
Is an Organic Acids Test worth it?
It can be, when three things are true. The ordinary explanations have been checked with your GP. Your symptoms cross several systems and have gone on long enough that you want a wider picture. And the answer would change what you actually do next, rather than sit in a folder.
How it is read matters as much as the test. The results show patterns rather than answers on their own, and they are meant to be read alongside your symptoms, diet, medications and history by someone trained to do it. Even the lab’s automated nutrition guide carries a disclaimer saying its algorithm works only on the biochemical data.
What I look at first. When an OAT comes back, I don’t start with the flagged bars. I start with what someone ate, drank and took in the days before they collected, because a high marker that lines up with a glass of wine or a supplement isn’t a finding.
Then I look for markers that agree with each other and with their story, read as groups, never one flag on its own. Anything that belongs with a doctor goes back to their GP.
And I don’t dose from the automated supplement guide. Supplements get decided from the whole picture.
If fatigue and brain fog are the main thing you are living with, our page on how we work with fatigue and brain fog lays out the wider approach.
If you have decided it is the right next step, our Organic Acids Test page has the options and what each one includes.
Not sure an Organic Acids Test is the right next step?
Bring your symptoms, any bloods you already have and whatever you have tried. A short call is usually enough to work out whether an Organic Acids Test, a different test or your GP comes first. No test is booked on that call.
Book a free 15-minute callFifteen minutes on the phone with Georgina, at no cost.
Common questions about organic acids testing
What is an organic acids test used for?
In specialist pathology labs, urine organic acid analysis is a first-tier test for a wide range of inherited metabolic disorders. In nutrition practice, a functional Organic Acids Test is used differently: to add context around energy, nutrient and gut-related patterns, read alongside symptoms and history. That second use has much less research behind it.
Is an organic acids test accurate?
Measuring a compound accurately and knowing what it means are two different things. Several markers also reflect recent food, drink and supplements, and the sample report from the lab we use shows reference limits without saying how they were set. A result is only as useful as the context it is read in.
Do I need to change what I eat before an organic acids test?
Follow the collection instructions that come with your test. Because foods, drinks and supplements can show up in the result, write down what you ate, drank and took in the few days before you collect, so it can be read against the report. Never stop a prescribed medicine for a test without talking to your prescriber.
Can an organic acids test show yeast or bacterial overgrowth?
Not directly. It measures by-products in urine that microbes can make, but it does not look at the gut itself, and some of those compounds also come from food. A stool microbiome test looks at the gut community, and small intestinal bacterial overgrowth is investigated with a breath test.
Does an organic acids test tell me which supplements to take?
Not on its own. The report from the lab we use can include an automatically generated nutrition guide, and the lab’s own disclaimer says that algorithm cannot account for your medical history, current medications, organ function or any other health condition. Supplement decisions belong with a practitioner who knows those things.
Sources
- Gallagher RC, Pollard L, Scott AI and colleagues. Laboratory analysis of organic acids, 2018 update: a technical standard of the American College of Medical Genetics and Genomics (ACMG). Genetics in Medicine, 2018;20(7):683-691. Urine organic acid analysis as a first-tier test for inborn errors of metabolism.
- Jones PM, Bennett MJ. Urine organic acid analysis for inherited metabolic disease using gas chromatography-mass spectrometry. Methods in Molecular Biology, 2010;603:423-431. Organic acids in urine can also come from drugs, xenobiotics and dietary supplements.
- Jones SL, Campbell B, Hart T. Laboratory tests commonly used in complementary and alternative medicine: a review of the evidence. Annals of Clinical Biochemistry, 2019;56(3):310-325. Tests offered in the United States, the United Kingdom and Australia, including established tests used for unvalidated purposes.
- NutriPATH. Organic Acids Metabolomic Mapping (test 4041), sample report, June 2026. The spot urine specimen, creatinine-corrected results against reference limits, the marker groups (DHPPA under microbial overgrowth, tartaric acid under yeast and fungal), and the algorithm-generated nutrition guide and its disclaimer.
- Guyman LA, Adlercreutz H, Koskela A and colleagues. Urinary 3-(3,5-dihydroxyphenyl)-1-propanoic acid, an alkylresorcinol metabolite, is a potential biomarker of whole-grain intake in a U.S. population. Journal of Nutrition, 2008;138(10):1957-1962.
- Domínguez-López I, Lamuela-Raventós RM, Razquin C and colleagues. Urinary tartaric acid as a biomarker of wine consumption and cardiovascular risk: the PREDIMED trial. European Heart Journal, 2025;46:161. Tartaric acid as a short-term marker of wine intake.
- Fernández-Cruz E, de la O V, Fernández-Diaz CM and colleagues. Urinary hippuric acid as a sex-dependent biomarker for fruit and nut intake raised from the EAT-Lancet index and nuclear magnetic resonance analysis. Metabolites, 2025;15:348. Hippuric acid in urine as a marker of polyphenol-rich food intake.
- Supakul S, Chabrun F, Genebrier S and colleagues. Diagnostic performances of urinary methylmalonic acid/creatinine ratio in vitamin B12 deficiency. Journal of Clinical Medicine, 2020;9:2335. Methylmalonic acid in vitamin B12 deficiency, and its rise with reduced kidney function.
- Healthdirect Australia. Fatigue. When to see a doctor about fatigue.
Important: This page is general information written by a clinical nutritionist. It is not medical advice and does not replace care from your GP or another qualified health professional. An Organic Acids Test does not diagnose, treat, cure or prevent any condition. Read our full disclaimer.
Written and reviewed by Georgina Waugh
Clinical Nutritionist, BHSc Nutritional Medicine
Last updated: 13 September 2026
Sources reviewed: NutriPATH’s test information and sample report, the ACMG technical standard for urine organic acid analysis, Healthdirect and the published research on dietary markers