Angela was that patient. Thirty-eight, two kids, a demanding legal career she used to be very good at. Three years of fatigue, irritability, word-finding problems, and muscle weakness. Three rounds of comprehensive conventional labs — all normal. A diagnosis of “burnout” that she knew was inadequate, because she’d addressed every obvious burnout variable systematically and was still sick.
Her organic acids test found what her standard labs had missed entirely: severely elevated methylmalonate indicating functional B12 deficiency despite a technically normal serum B12, elevated pyroglutamate indicating severe glutathione depletion and ongoing oxidative stress, elevated 3-methylhistidine indicating excessive muscle protein catabolism, and elevated arabinose combined with elevated tartaric acid indicating yeast overgrowth producing metabolic byproducts that directly inhibit the Krebs cycle. None of it was on anything her previous physicians had ordered. All of it was actionable.
That’s what the organic acids test does. This piece walks through how it works, what it measures, how to read the findings that actually matter, and what to do once they’re identified.
What Organic Acids Are — and Why Testing Them Tells the Metabolic Truth
Organic acids are small carbon-containing compounds thrown off as intermediates and byproducts of cellular metabolism — generated mostly in mitochondria through the Krebs cycle, fatty acid oxidation, and amino acid metabolism, and also produced by gut microbial fermentation. They show up in urine in amounts too small for standard urinalysis to notice, but plenty large enough for sensitive analytical techniques to quantify.
Here’s the underlying logic. Practically every cellular metabolic process throws off a characteristic organic acid byproduct. When a biochemical pathway gets disrupted — by a missing nutrient cofactor, an enzyme malfunctioning (genetically or acquired), a toxin, or an infection producing metabolite-inhibiting compounds — the organic acids stuck behind the disrupted step pile up, or the ones downstream vanish, and the resulting pattern in urine is about as diagnostically specific as a fingerprint.
Take a concrete example. The Krebs cycle enzyme alpha-ketoglutarate dehydrogenase needs four cofactors — thiamine (B1), riboflavin (B2), niacin (B3), pantothenate (B5), and lipoic acid — to convert alpha-ketoglutarate into succinyl-CoA. Short any of those cofactors, and alpha-ketoglutaric acid backs up in the cell, spills into circulation, and shows up elevated in urine. Test for elevated alpha-ketoglutarate and you’ve indirectly confirmed a functional deficiency in one or more of those five cofactors, without measuring each one individually. One organic acid measurement captures the functional status of an entire enzyme complex and everything it depends on.
The organic acids test (OAT) — offered by Mosaic Diagnostics (formerly Great Plains Laboratory), Genova Diagnostics (as Organix), and a handful of other functional medicine labs — runs a single first-morning urine sample through gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-mass spectrometry (LC-MS/MS). These techniques separate and identify individual organic acid molecules with real specificity, quantifying somewhere around 70-100 compounds across multiple metabolic pathways in one test run.
Krebs Cycle Markers: Reading Mitochondrial Energy Production
The Krebs cycle (citric acid cycle) is the central metabolic highway inside mitochondria, generating the electron carriers — NADH and FADH2 — that power the electron transport chain for ATP synthesis. Each step runs on a specific enzyme requiring specific cofactors. Any step fails, the organic acid at that step piles up right behind it.
The Krebs cycle markers that matter clinically:
Citric acid:
The first compound in the cycle, formed from acetyl-CoA and oxaloacetate. Low citrate can point to impaired pyruvate conversion into acetyl-CoA — PDH enzyme dysfunction from B1 or B5 deficiency, or from chronic heavy metal accumulation inhibiting the enzyme. Elevated citrate can mean it’s being exported to the cytoplasm for lipid synthesis instead — a pattern seen in hyperinsulinemia and metabolic syndrome, where citrate leaves the mitochondria to feed fatty acid synthesis.
Isocitric and aconitic acids:
Second and third in line. Elevated isocitrate with normal aconitate can suggest aconitase dysfunction — this iron-sulfur cluster enzyme is unusually sensitive to nitric oxide and superoxide stress, which in some contexts makes it a marker of mitochondrial oxidative damage.
Alpha-ketoglutaric acid:
Elevations here are among the most common clinically significant Krebs findings on OAT, and they point to functional insufficiency of B1, B2, B3, B5, or lipoic acid — all required for the alpha-ketoglutarate dehydrogenase complex. A B-complex covering all five gives you a direct restoration rationale when alpha-KG comes back high. Worth flagging: alpha-KG is also produced from glutamate, so an elevation can reflect elevated glutamatergic activity — stress-driven glutamate excess — rather than pure cofactor deficiency. Context matters here.
Succinic acid:
Elevated succinate with normal or reduced fumaric acid suggests impaired succinate dehydrogenase — the enzyme that doubles as Complex II of the electron transport chain. That dual role matters. It’s the only Krebs cycle enzyme embedded in the inner mitochondrial membrane, so impairing it hits the Krebs cycle and the electron transport chain at the same time. CoQ10 deficiency (the electron carrier shuttling between Complex II and Complex III) and certain heavy metal toxicities both impair succinate dehydrogenase.
Pyruvic and lactic acids:
Pyruvate is the gateway — produced by glycolysis and converted to acetyl-CoA by pyruvate dehydrogenase (PDH) for entry into the Krebs cycle, or converted to lactate by lactate dehydrogenase when PDH is impaired or oxygen runs short. An elevated lactate:pyruvate ratio is the classic marker of mitochondrial respiratory chain dysfunction — seen in primary mitochondrial disease and in acquired mitochondrial dysfunction from toxins, heavy metals, or severe CoQ10 deficiency. Elevated pyruvate alone, with normal lactate, points more toward PDH enzyme dysfunction or cofactor deficiency — B1 being the most critical PDH cofactor, and thiamine deficiency being the textbook cause of pyruvate buildup and, in severe cases, lactic acidosis.
Pattern matters more than any single number. Multiple Krebs elevations scattered across several steps point to global mitochondrial dysfunction — possibly from severe CoQ10 deficiency, heavy metal toxicity (mercury, arsenic, lead all inhibit mitochondrial enzymes), or profound multifactorial depletion. A cluster at one enzymatic step points to a targeted cofactor problem instead. A competent OAT reader looks at the whole Krebs pattern, not isolated abnormalities one at a time.
Fatty Acid Oxidation: Whether Your Mitochondria Burn Fat Efficiently
Fatty acid beta-oxidation in mitochondria is the primary aerobic fuel source at rest, during fasting, and during low-to-moderate intensity activity. Impair this pathway and cellular energy production drifts away from efficient fat oxidation toward backup routes — and characteristic organic acids pile up as a result.
Adipic, suberic, and sebacic acids (dicarboxylic acids):
These medium and long-chain dicarboxylic acids show up when mitochondrial beta-oxidation of long-chain fatty acids is impaired and the cell shifts to microsomal omega-oxidation as a backup. Elevation of these three is a sensitive marker of fatty acid oxidation dysfunction. Causes include carnitine deficiency (carnitine ferries long-chain fatty acids across the inner mitochondrial membrane — without it, fatty acids never reach beta-oxidation), riboflavin (B2) deficiency (B2 is required for the FADH2-linked dehydrogenase steps in beta-oxidation), CoQ10 deficiency, and primary genetic defects in the oxidation enzymes themselves.
Carnitine insufficiency deserves its own paragraph. The body makes carnitine endogenously from lysine and methionine, with B6, B3, vitamin C, and iron as cofactors — but plenty of clinical situations reduce what’s available: vegan or vegetarian diets (carnitine lives almost exclusively in animal foods), chronic kidney disease (impaired renal reabsorption), valproate therapy (a common seizure medication that significantly depletes carnitine), and high oxidative stress states (carnitine gets consumed protecting against acylcarnitine buildup). L-carnitine supplementation — with the acetyl-L-carnitine form (ALCAR) adding a brain-penetrant acetyl group — is the targeted fix for carnitine-insufficient fatty acid oxidation.
3-OH-Butyric acid (hydroxybutyrate):
The primary ketone body, elevated during fasting, on a ketogenic diet, and in diabetic ketoacidosis. In a non-fasting test with normal carbohydrate intake, elevated hydroxybutyrate suggests impaired glucose utilization with a compensatory shift toward fat oxidation and ketogenesis — the cellular-energy-level picture of insulin resistance or type 2 diabetes. This marker adds context to the metabolic picture that standard blood glucose can’t give you on its own.
Neurotransmitter Metabolites: The Functional Psychiatry Connection
- HVA (Homovanillic acid): The primary metabolite of dopamine degradation by MAO and COMT. Elevated HVA suggests high dopamine turnover — chronic stress-driven catecholamine excess, or a COMT Met/Met polymorphism reducing HVA clearance and letting dopamine accumulate — or simply high dopaminergic activity. Low HVA suggests reduced dopamine synthesis, from tyrosine deficiency (inadequate protein intake, specifically low phenylalanine/tyrosine), B6 deficiency (tyrosine hydroxylase needs B6), iron deficiency (the same enzyme needs iron too), or hypothyroidism (thyroid hormone regulates catecholamine synthesis at several steps). Low HVA paired with anhedonia, low motivation, executive dysfunction, fatigue, and trouble sustaining mental effort is one of the most directly treatable patterns on the whole test — L-tyrosine on an empty stomach, combined with B6 and with iron if ferritin is low, addresses the substrate and cofactor deficiency head-on.
- VMA (Vanillylmandelic acid): The primary metabolite of norepinephrine and epinephrine. The HVA:VMA ratio gives a comparative read on dopaminergic versus noradrenergic balance. Significantly elevated VMA on its own suggests noradrenergic hyperactivation — the chronic fight-or-flight pattern seen in prolonged psychological stress, PTSD, and severe anxiety disorders. Very high VMA warrants a serum catecholamine test to rule out pheochromocytoma — a rare but serious catecholamine-secreting adrenal tumor — before chalking it up to stress alone. Low VMA suggests insufficient norepinephrine production, relevant for attentional disorders, depression with prominent anhedonia, and orthostatic hypotension.
- 5-HIAA (5-Hydroxyindoleacetic acid): The primary serotonin metabolite, and low 5-HIAA is one of the most clinically significant findings on the whole test for mood and pain presentations. It signals low serotonin turnover — from insufficient tryptophan substrate (inadequate protein, or chronic-illness-driven muscle catabolism reducing amino acid availability), B6 insufficiency (tryptophan hydroxylase needs pyridoxal phosphate), inflammatory tryptophan diversion through the kynurenine pathway (interferon-gamma inducing the IDO enzyme, redirecting tryptophan away from serotonin synthesis — the mechanism behind inflammation-driven depression), or gut dysbiosis cutting into the 90% of the body’s serotonin that’s produced in enterochromaffin cells.
Neurotransmitters get synthesized in the brain and peripheral nervous system from dietary amino acid precursors, act locally at synapses, and get degraded within the CNS mostly by MAO and COMT enzymes. Those degradation products enter circulation and get excreted in urine — an indirect window into neurotransmitter system activity that no blood test can give you.
That last point has real clinical weight. When 5-HIAA is low alongside elevated kynurenic acid — signaling the inflammatory diversion mechanism — an SSRI isn’t the right answer. SSRIs block serotonin reuptake. They can’t manufacture more 5-HIAA when the precursor pathway itself is depleted. The intervention that actually addresses low 5-HIAA from inflammatory tryptophan diversion is reducing the inflammatory driver — gut dysbiosis, chronic infection, sleep deprivation, obesity-related systemic inflammation — and supporting serotonin synthesis with tryptophan or 5-HTP alongside B6. That’s a genuinely different approach than pharmaceutical intervention, and it’s guided by data serum testing can’t give you.
Kynurenic and quinolinic acids: Both are tryptophan metabolites from the kynurenine pathway, which dominates under inflammatory conditions. Kynurenic acid reduces NMDA receptor activity — potentially protective against excess glutamate, but at high concentrations it produces cognitive symptoms, including a “disconnected” feeling some patients describe. Quinolinic acid is an NMDA receptor agonist and it’s directly neurotoxic — produced in excess by activated microglia and peripheral macrophages during inflammation. Quinolinate elevation correlates with neuroinflammation, treatment-resistant depression, and cognitive impairment. Elevated quinolinate on OAT, in a patient with depression and cognitive symptoms, is about as direct a biochemical signal of neuroinflammation-driven psychiatric presentation as you’ll find — with very different treatment implications than a symptom-criteria diagnosis of “major depressive disorder.”
Nutritional Markers: Finding Deficiencies Standard Tests Miss
This section holds some of the most practically useful information on the whole test — functional indicators of vitamin and cofactor status that are more sensitive than the equivalent serum measurements, because they’re measuring biochemical function, not just concentration in blood.
- Methylmalonic acid (MMA): Angela’s most critical finding, and one of the most important markers on the whole panel. MMA builds up when methylmalonyl-CoA can’t be converted to succinyl-CoA — a reaction that flatly requires adenosylcobalamin, one of the two active forms of B12. MMA elevation is the functional gold standard for B12 insufficiency at the cellular level. It rises before serum B12 even falls, making it 3-5 times more sensitive for functional B12 deficiency than a serum B12 measurement. Normal serum B12 with elevated MMA isn’t unusual — it reflects adequate binding-protein transport of inactive B12 forms while the active B12 inside cells is actually depleted. It shows up especially often in people with MTHFR variants (impaired conversion of B12 to its active forms), people on metformin (which impairs B12 absorption), vegans (dietary depletion), and people on proton pump inhibitors (impaired B12 release from food protein). Treatment: sublingual methylcobalamin, which sidesteps the absorption problem entirely, or hydroxocobalamin injection in severe cases.
- FIGLU (Formiminoglutamic acid): Accumulates when glutamate can’t be processed by the folate-requiring enzyme FIGLU transferase. Elevated FIGLU signals functional folate insufficiency — a finding serum folate can miss entirely, since serum folate can look “normal” even when cellular folate utilization is impaired (particularly with MTHFR variants). FIGLU elevation alongside MMA elevation confirms combined B12 and folate insufficiency — both methylation cycle inputs failing at once, with compounding downstream consequences.
- Xanthurenic and kynurenic acids: As a B6 marker, elevated xanthurenic acid specifically signals insufficient pyridoxal phosphate (active B6) for the kynurenine aminotransferase enzymes in the tryptophan pathway. And xanthurenic acid itself forms complexes with insulin and impairs insulin receptor signaling — a mechanism linking B6 deficiency to insulin resistance at the biochemical level that standard metabolic testing never picks up. B6 supplementation, as pyridoxal-5′-phosphate (the bioactive form), addresses both the deficiency and its downstream metabolic consequences directly.
- Pyroglutamic acid: Angela’s elevated pyroglutamate flagged severe glutathione depletion — one of the more important antioxidant and detoxification findings on the whole test. Pyroglutamate accumulates when the gamma-glutamylcysteine (glutathione biosynthesis) pathway is under high demand relative to available substrate. It means the body is burning through glutathione faster than it can replace it — from high oxidative stress, chronic toxin exposure, significant inflammation, or precursor amino acid shortage (cysteine being the rate-limiting glutathione precursor). Elevated pyroglutamate with fatigue, chemical sensitivity, poor detoxification, and recurrent illness justifies going hard on glutathione precursor support: NAC (N-acetyl cysteine), glycine, and glutamine together, covering all three precursor amino acids at once.
- Pyrrole-2-carboxylic acid: A functional marker of B6 utilization, elevated when B6 is functionally insufficient for the pyrroline-5-carboxylate pathway. More sensitive than serum B6, which can look “normal” while cellular utilization is impaired — especially under high oxidative stress, which accelerates B6 catabolism to pyridoxic acid instead of maintaining it as pyridoxal phosphate.
Microbial Organic Acid Markers: The Gut-Metabolome Window
A large share of OAT markers reflect gut microbial metabolic activity — compounds bacteria and yeast produce that get absorbed into circulation and excreted in urine. These give an indirect functional read on gut flora composition and activity, distinct from and complementary to the direct organism identification a stool test like GI-MAP provides.
Arabinose: A pentose sugar and a component of Candida cell wall arabinogalactan. Elevated urinary arabinose is a specific marker of Candida overgrowth — one of the more reliable OAT markers for gut yeast around. Its real value: it detects Candida that’s alive and metabolically active, not just DNA presence — complementary to GI-MAP’s PCR-based detection rather than redundant with it.
Tartaric acid: A specific metabolic product of Candida fermentation, and a particularly important one, because tartaric acid is a potent inhibitor of the Krebs cycle enzyme succinate dehydrogenase. That gives you a direct biochemical mechanism for how gut yeast overgrowth produces systemic mitochondrial dysfunction and fatigue: elevated gut Candida, elevated tartaric acid absorption, tartaric acid inhibiting succinate dehydrogenase, impaired Krebs cycle at the succinate step, reduced ATP production, fatigue. Not a theoretical chain — William Shaw at Great Plains/Mosaic proposed it, and it’s one of the clearer mechanistic explanations out there for the fatigue that tags along with significant gut yeast overgrowth.
Citramalic acid: Also associated with Aspergillus and some Candida species. Elevated citramalate alongside arabinose and tartaric acid reinforces the yeast overgrowth read.
DHPPA (3,4-Dihydroxyphenylpropionic acid) and HPAA (4-Hydroxyphenylacetic acid): Produced by specific gut bacteria — primarily Clostridia species — fermenting tyrosine and phenylalanine in the large intestine. Both compounds have dopaminergic activity. DHPPA specifically inhibits dopamine-beta-hydroxylase (the enzyme converting dopamine to norepinephrine) and can displace dopamine from vesicular storage, disrupting dopaminergic signaling without touching dopamine synthesis itself. Elevated DHPPA and HPAA have shown up consistently in OAT research on autism spectrum disorder patients, offering a gut-brain axis mechanism for behavioral and cognitive features of ASD. In adults with chronic cognitive symptoms and mood dysregulation, elevated DHPPA and HPAA on OAT alongside GI-MAP findings of Clostridia overgrowth give you a treatable explanation. Targeted botanical antimicrobials for Clostridia — berberine, oregano oil — combined with high-dose probiotic recolonization address the source directly.
Oxalic acid: Can come from three places — dietary oxalate (spinach, almonds, chocolate, rhubarb), gut yeast overgrowth (Aspergillus species and some Candida strains produce oxalate as a byproduct), or endogenous metabolism through the hydroxyproline and glyoxylate pathways. Urine oxalate elevated beyond what diet alone would explain suggests either yeast-derived production or primary hyperoxaluria from a genetic enzyme defect. Beyond the kidney stone risk everyone worries about, elevated oxalate inhibits multiple Krebs cycle enzymes and electron transport components — which matters for fatigue presentations well beyond nephrolithiasis. ME/CFS researcher Robert Naviaux has explored mitochondrial toxicity from accumulated metabolic waste products, oxalate included, in chronic fatigue. Ongoing area of investigation, that one.
The RWS OAT Interpretation Protocol: Three-Layer Clinical Analysis
Layer 1 — Urgent findings requiring immediate protocol prioritization: Significantly elevated yeast markers (arabinose, tartaric acid) signaling active microbial interference with mitochondrial function. Markedly elevated Clostridia metabolites (DHPPA, HPAA) signaling neurotransmitter-disrupting bacterial overgrowth. Significantly elevated quinolinic acid signaling active neuroinflammation. A very high pyruvate:lactate ratio suggesting significant respiratory chain dysfunction. These drive the primary protocol priorities, and they often explain why nothing else has worked so far.
Layer 2 — Nutritional deficiency pattern: Which B vitamins show functional deficiency markers? Elevated MMA points to B12 functional deficiency. Elevated FIGLU points to folate (and possibly B12) functional deficiency. Elevated xanthurenic acid points to B6 functional deficiency. Elevated alpha-ketoglutarate points to B1/B2/B3/B5/lipoic acid complex insufficiency. Elevated pyroglutamate points to glutathione precursor insufficiency — cysteine, glycine, glutamine. This layer sets the specific supplementation protocol and dose priorities.
Layer 3 — Metabolic context and system-level picture: What do all the patterns together suggest about someone’s overall metabolic situation? High oxidative stress (elevated 8-OH-dG and elevated pyroglutamate together confirm oxidative DNA damage alongside depleted antioxidant capacity)? A global mitochondrial dysfunction pattern (multiple Krebs abnormalities, dicarboxylic acids)? Inflammatory tryptophan diversion (elevated quinolinic, low 5-HIAA, elevated kynurenic)? Dopaminergic insufficiency with normal adrenergic function (low HVA, normal VMA)? This layer guides the broader lifestyle and supplementation priorities — the ones addressing the metabolic context, not just individual markers in isolation.
Oxidative Stress and Mitochondrial DNA Damage Markers
Several OAT markers assess oxidative stress and cellular damage directly — the cumulative result of insufficient antioxidant defense against reactive oxygen species from mitochondria and from environmental sources.
8-Hydroxy-2′-deoxyguanosine (8-OH-dG): this nucleoside adduct forms when hydroxyl radicals attack the guanine base of DNA at the 8-position. Urinary 8-OH-dG is the most widely validated urinary biomarker of oxidative DNA damage — it measures how much oxidative attack the genome is actually absorbing. Elevated 8-OH-dG confirms significant oxidative stress with real DNA damage, not just an elevated free radical load. That finding changes clinical priority — when 8-OH-dG is significantly elevated, antioxidant support (NAC, CoQ10, R-lipoic acid, vitamin E as mixed tocopherols) and reducing oxidative sources (heavy metal assessment, gut microbial toxin reduction, smoking cessation) move to the front of the line. 8-OH-dG gets repaired by base excision repair enzymes that require magnesium — so magnesium insufficiency compounds oxidative DNA damage by impairing the repair response on top of everything else.
Hydroxymethylglutaric acid (HMG) comes out of the HMG-CoA pathway — the same pathway statins target. Elevated HMG suggests acetyl-CoA is being diverted toward cholesterol synthesis instead of Krebs cycle oxidation, a pattern seen in certain inborn errors of metabolism and in some mitochondrial dysfunction contexts. In patients on statin therapy, elevated HMG may reflect disrupted mevalonate pathway metabolism — worth noting, because statins reduce not just cholesterol but CoQ10 synthesis from the same pathway, which gives a mechanistic rationale for the muscle symptoms and mitochondrial dysfunction sometimes blamed on statin use.
Methylsuccinic acid and ethylmalonic acid mark short-chain acyl-CoA dehydrogenase (SCAD) function — an enzyme in the fatty acid oxidation pathway that needs riboflavin (B2) as a cofactor. Elevation of these two alongside the medium-chain dicarboxylic acids (adipic, suberic) builds a fatty acid oxidation impairment pattern that specifically implicates riboflavin insufficiency — the finding that justifies high-dose riboflavin in some mitochondrial support protocols.
Practical Implementation: From OAT Results to Protocol
For each category of OAT abnormality, a targeted intervention:
Functional B12 deficiency (elevated MMA): Sublingual methylcobalamin. The sublingual route bypasses gastric acid and intrinsic factor requirements — essential for patients with gastric acid suppression or malabsorption. If MTHFR variants are present, hydroxocobalamin or adenosylcobalamin may work better, since they skip the MTHFR-dependent conversion step. Retest MMA specifically at 8-12 weeks to confirm normalization; symptom improvement usually shows up before the numbers fully normalize.
Functional folate deficiency (elevated FIGLU): Methylfolate (L-5-MTHF) rather than folic acid, which requires MTHFR conversion that may be genetically impaired, and which is always impaired during active B12 deficiency (since B12 is required for the folate cycle to run). B12 and folate are interdependent — supplement both together. Elevated homocysteine alongside elevated FIGLU and MMA confirms the combined methylation cycle failure that requires both.
Multiple Krebs cycle markers elevated: Comprehensive B-complex covering thiamine, riboflavin, niacinamide and pantothenate, plus R-lipoic acid and CoQ10 in the ubiquinol form. Magnesium as glycinate or malate, since it serves as cofactor for several Krebs cycle enzymes at once. Carnitine, either L-carnitine or acetyl-L-carnitine, for fatty acid transport into mitochondria, especially if dicarboxylic acids are also elevated.
Elevated glutathione demand (pyroglutamate): NAC as the rate-limiting cysteine precursor, with glycine and glutamine alongside it. Between them, the three cover every glutathione precursor amino acid directly. For severe depletion: liposomal glutathione layered on top of the precursors. IV glutathione infusion for very severe cases with clear evidence of significant oxidative stress — rashes, chemical sensitivities, poor detoxification. And address whatever’s driving the demand in the first place — concurrent microbial infections (yeast, Clostridia) are often the primary oxidative load burning through glutathione.
Elevated yeast markers (arabinose, tartaric): Low-sugar, low-refined-carbohydrate eating as the baseline. Caprylic acid, undecylenic acid, or oregano oil standardized to its carvacrol content as the primary botanical antifungals. Berberine adds biofilm disruption. Saccharomyces boulardii — paradoxically, this reduces pathogenic Candida. Minimum 8-12 weeks for full clearance; retest OAT afterward to confirm arabinose and tartaric acid have normalized before calling the course done.
Elevated Clostridia metabolites (DHPPA, HPAA): Berberine, which has the best gram-positive Clostridia coverage of the botanicals, oregano oil, and high-dose probiotics — particularly spore-forming Bacillus strains, which survive the antimicrobial protocol and competitively crowd out Clostridia. Dietary modification reducing Clostridia substrate — fermentable protein-rich foods, in a dysbiosis context. 6-8 weeks, with follow-up OAT and GI-MAP to confirm normalization.
Organic Acids Test Q&A
- How is the OAT different from the GI-MAP?
The GI-MAP directly identifies gut organisms by their DNA using quantitative PCR. The OAT identifies the metabolic consequences — what the organisms and the person’s own cells are doing metabolically — from urine excretion products. GI-MAP tells you who’s living in the gut and roughly how many. OAT tells you what metabolic impact they’re having on the body, plus the nutritional and mitochondrial status underneath it all. Different angles, complementary information. For complex chronic presentations, running both together gives a fuller picture than either one alone. - Can the OAT be done in children?
Yes — it was originally developed for newborn metabolic disease screening and is extremely well-validated in pediatric populations. In autism spectrum disorder research, specific OAT patterns — elevated HPAA, DHPPA, arabinose, and neurotransmitter marker abnormalities — rank among the most consistently replicated biochemical findings out there. It’s a standard assessment in functional medicine pediatrics and autism-focused integrative programs. Any interventions get dosed by weight and age. - Do I need to prepare differently for the OAT compared to standard urinalysis?
Yes, significantly. First-morning urine after a 10+ hour fast is required — eating or drinking anything but water before collection will meaningfully skew results. Avoid grapes, raisins, wine, fruit juices, and high-oxalate foods (spinach, almonds, chocolate) for 48 hours beforehand, since these foods contain organic acids that will falsely elevate the matching OAT markers. Stop probiotics two weeks before testing to get an accurate baseline of gut microbial activity. Skip high-dose vitamin supplements the evening before — they can show up directly in urine and skew marker levels. The test measures the fasting metabolic state; any deviation, or interference from food- or supplement-derived organic acids, drags down accuracy. - What is the difference between Mosaic/Great Plains OAT and Genova Organix?
Both use mass spectrometry and measure overlapping but not identical marker sets. Mosaic/Great Plains OAT includes the specific DHPPA and HPAA markers for Clostridia metabolites, highly relevant for neurological presentations and ASD. Genova Organix Comprehensive includes broader amino acid metabolism markers and some additional nutritional markers. Both labs have established reference ranges and interpretive commentary. The choice usually comes down to practitioner familiarity, insurance, or specific marker needs — no single objectively superior option for every clinical presentation. - Is the OAT covered by insurance?
Occasionally — specific markers, particularly MMA for B12 deficiency, and organic acid profiles for suspected inborn errors of metabolism in children, get covered in specific diagnostic contexts. As a functional medicine panel ordered for optimization rather than disease diagnosis, most plans don’t cover it. Out-of-pocket cost through functional medicine labs runs roughly $250-400. Direct-pay options exist through most labs without a physician order in most states. For patients who’ve had extensive negative conventional workups, the functional information it provides often marks a genuine turning point — the first actionable findings after months or years of getting nowhere.
The case for the OAT in complex, unexplained chronic illness is simple: it looks at a dimension of cellular biology that standard clinical testing simply can’t see. Standard labs evaluate organ function — kidney, liver, thyroid — blood cell production, and markers of gross pathology. The OAT evaluates the metabolic machinery inside cells: whether mitochondria are cycling efficiently, whether neurotransmitters are being made from adequate precursors, whether gut organisms are releasing compounds that interfere with cellular function, whether antioxidant capacity is keeping pace with oxidative demand. For patients with unexplained fatigue, mood disorders, or cognitive symptoms, these aren’t side questions. They’re often the central ones. The OAT answers them with a single urine specimen. That accessibility, combined with the sheer breadth of what it reveals, makes it one of the highest-yield first-tier tests in functional medicine for exactly the presentations standard medicine can’t explain.
The OAT works best paired with a GI-MAP for patients showing significant microbial marker elevations, and alongside a comprehensive thyroid panel for patients with mitochondrial dysfunction patterns — because thyroid hormone directly regulates mitochondrial biogenesis, and functional hypothyroidism (even without a diagnostic TSH elevation) produces Krebs cycle slowdown that’s indistinguishable on OAT from plain cofactor deficiency. Getting the full picture right takes both tests.
Angela’s protocol, built from her OAT findings: sublingual methylcobalamin for elevated MMA; methylfolate with B6 as P5P for combined methylation support and xanthurenic normalization; NAC and glycine for pyroglutamate and glutathione repletion; caprylic acid plus berberine for ten weeks for arabinose and tartaric normalization; comprehensive B-complex covering B1, B2, B3, and B5 for Krebs cycle cofactor support. At three months, her follow-up OAT showed MMA normalized, pyroglutamate down 65%, arabinose and tartaric acid below the elevated range, alpha-KG improved. Her fatigue improved by roughly 70% by her own assessment — not complete resolution, but a return to functional capacity her previous physicians had told her to stop expecting. The word-finding problems largely resolved. Her “burnout” had a metabolic fingerprint the whole time. It just took the right test, and the right practitioner willing to act on what it showed.
The Practical Framework: Applying Organic Acids Test Them In Real Life
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