The Organic Acids Test (OAT) is one of the most comprehensive metabolic assessments available. By measuring over 75 metabolic markers in a simple urine sample, it provides a detailed picture of how your cells are producing energy, how your brain chemistry is functioning, whether your nutritional status is adequate and whether there are underlying infections or imbalances driving your symptoms.
The OAT is particularly valuable for women dealing with persistent fatigue, brain fog, low mood or anxiety that does not fully respond to lifestyle changes. These symptoms often have metabolic and nutritional drivers: disrupted mitochondrial function, B-vitamin deficiencies, neurotransmitter imbalances, oxidative stress, that standard blood tests do not assess.
Like all functional tests I order, the OAT is interpreted in the full context of your clinical picture. The results directly inform a personalised nutritional and supplement protocol.
Persistent fatigue despite adequate sleep
Brain fog, poor memory or difficulty concentrating
Low mood, anxiety or emotional dysregulation
Muscle weakness or poor exercise recovery
Recurrent infections or slow healing
Suspected nutritional deficiencies not identified on standard tests
Postpartum depletion that has not resolved with time
The OAT measures markers across multiple metabolic pathways: mitochondrial function (energy production at the cellular level), B-vitamin status, neurotransmitter metabolism (serotonin, dopamine, adrenaline), fatty acid oxidation, detoxification capacity, oxidative stress and markers of yeast and bacterial overgrowth.
What makes the OAT particularly powerful is that it shows functional deficiency: not just whether a nutrient is present in the blood, but whether the metabolic pathways that depend on it are working properly. A B12 level that looks normal on a blood test can still be functionally inadequate if the pathways that use B12 are impaired.
The OAT costs £355 including the test kit and a full results review and personalised protocol with Kat.
The Organic Acids Test uses a simple first-morning urine sample collected at home and sent to the laboratory in the kit provided. No blood draw or clinic visit is required. Results are typically available within two to three weeks.
The OAT is most valuable for women with persistent symptoms (particularly fatigue, brain fog, mood issues or poor exercise recovery) where standard blood tests have not found a clear explanation. It is also frequently used alongside the DUTCH test for a comprehensive picture.
Yes. The OAT is often run alongside the DUTCH Complete or a gut health test to provide a fuller picture. Combined testing can be more cost-effective and provides results that reinforce and contextualise each other.
Book a free discovery call to find out whether the OAT is the right test for your symptoms.
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