Histamine Intolerance Testing: Understanding the Histamine Clearance Index
Understanding histamine metabolism is essential when evaluating patients with complex, multisystem symptoms. This video provides a clinical overview of the Histamine Clearance Index and its role in assessing the body’s ability to break down and eliminate histamine.
In this educational overview, you’ll learn how impaired histamine clearance can contribute to a wide range of patient symptoms, including gastrointestinal disturbances, headaches, skin reactions, and neurological complaints.
The Histamine Clearance Index is a histamine intolerance test designed to evaluate how efficiently histamine is cleared from the body. Rather than focusing solely on symptoms, this approach offers a functional assessment of histamine metabolism—helping practitioners identify underlying contributors to histamine-related presentations.
Watch to learn:
- The role of histamine in the body and its widespread physiological effects
- Common symptoms associated with histamine intolerance
- Key pathways involved in histamine metabolism, including DAO activity
- Factors that may impair histamine breakdown, such as nutrient deficiencies, medications, and gut dysfunction
- Clinical strategies to support histamine clearance, including dietary, nutritional, and gut‑focused interventions
Reduced histamine clearance may reflect deeper physiological imbalances, including dysbiosis, impaired intestinal integrity, or insufficient nutrient cofactors required for enzymatic activity.
When used alongside stool testing, such as GI‑MAP®, the Histamine Clearance Index can help identify microbial contributions to histamine burden and support a more comprehensive, systems-based approach to patient care.
Learn More
Explore the Histamine Clearance Index and access additional clinical resources, including the interpretive guide and sample report.
Jenn Evon, MS, CNS
Jenn Evon is part of the Clinical Education team at Diagnostic Solutions Laboratory. She holds a Master’s in Human Nutrition and Functional Medicine from the University of Western States and is a Certified Nutrition Specialist. Passionate about health as our greatest asset, she empowers practitioners and patients through education and support. Her clinical interests include gut health, hormones, neurotransmitters, healthy aging, and behavior change.
The opinions expressed in this presentation are the author's own. Information is provided for informational purposes only and is not meant to be a substitute for personal advice provided by a doctor or other qualified health care professional. Patients should not use the information contained herein for diagnosing a health or fitness problem or disease. Patients should always consult with a doctor or other health care professional for medical advice or information about diagnosis and treatment.