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Histamine Tolerance Test – Diagnosis & Process

The histamine tolerance test evaluates whether the body can adequately break down histamine. It helps diagnose histamine intolerance and explains symptoms such as headaches or skin reactions.

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The histamine tolerance test evaluates whether the body can adequately break down histamine. It helps diagnose histamine intolerance and explains symptoms such as headaches or skin reactions.

What Is the Histamine Tolerance Test?

The histamine tolerance test is a diagnostic procedure used to determine whether the human body is capable of breaking down histamine efficiently. Histamine is a biogenic amine found naturally in many foods and also produced by the body itself. When the breakdown of histamine is impaired, the condition is referred to as histamine intolerance. The test helps identify this intolerance and distinguish it from other conditions such as food allergies.

When Is the Test Recommended?

The histamine tolerance test is typically recommended when patients repeatedly experience symptoms after consuming certain foods, including:

Headaches or migraines
Skin reactions such as flushing, itching, or hives
Gastrointestinal complaints (nausea, diarrhea, abdominal pain)
Runny or blocked nose
Rapid heartbeat or drop in blood pressure
Sleep disturbances or chronic fatigue

It is especially useful when food allergies have already been ruled out and unexplained food intolerances persist.

How Is the Histamine Tolerance Test Performed?

Several methods are used to assess histamine tolerance:

Oral Provocation Test

In the oral provocation test, the patient consumes a defined amount of histamine – usually in capsule or liquid form. Symptoms and physical reactions are then monitored and recorded over a set period. This method is considered the gold standard for diagnosing histamine intolerance, but should only be performed under medical supervision due to the potential for stronger reactions in some individuals.

Blood Test (Diamine Oxidase Measurement)

A commonly used approach is the measurement of diamine oxidase (DAO) levels in the blood. DAO is the primary enzyme responsible for breaking down ingested histamine in the gut. Low DAO activity may indicate reduced histamine tolerance. The ratio of histamine to DAO can also be assessed for a more comprehensive evaluation.

Plasma Histamine Levels

This method measures the concentration of free histamine in the blood plasma. Elevated plasma histamine levels may suggest impaired histamine degradation or excessive histamine release. This marker is typically interpreted alongside other test results.

Food Diary and Elimination Diet

In addition to laboratory testing, patients are often asked to keep a food diary recording meals and associated symptoms. A low-histamine elimination diet followed by a controlled reintroduction of high-histamine foods can help confirm the relationship between histamine intake and symptoms.

Interpreting the Test Results

Test results help determine whether histamine intolerance is present. A low DAO level or a clear symptomatic reaction during the provocation test supports this diagnosis. However, no single test is definitive on its own – the diagnosis is always made in the context of symptoms, dietary habits, and overall test findings.

What Happens After the Test?

If histamine intolerance is confirmed, individualized nutritional counseling is recommended. The goal is to identify and reduce high-histamine foods in the diet. Commonly avoided foods include aged cheeses, red wine, salami, canned fish, and fermented products. Taking DAO enzyme supplements before histamine-rich meals can also help reduce symptoms. In some cases, antihistamines may be prescribed to manage acute reactions.

Important Notes

Before undergoing an oral provocation test, certain medications that inhibit histamine breakdown may need to be paused – such as some pain relievers, antidepressants, or antibiotics. This should always be done in consultation with a physician. It is also important to note that the histamine tolerance test is not designed to diagnose a histamine allergy, which involves a different immunological mechanism.

References

Maintz L, Novak N. Histamine and histamine intolerance. American Journal of Clinical Nutrition, 2007; 85(5):1185–1196. Available via PubMed.
Reese I et al. Guideline on the management of suspected adverse reactions to ingested histamine. Allergo Journal International, 2017; 26(2):72–79.
Comas-Baste O et al. Histamine Intolerance: The Current State of the Art. Biomolecules, 2020; 10(8):1181.

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