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Histamine Tolerance Markers – Diagnosis and Relevance

Histamine tolerance markers are diagnostic blood parameters that indicate impaired histamine metabolism. They are used in laboratory medicine to investigate histamine intolerance.

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Things worth knowing about "Histamine Tolerance Markers"

Histamine tolerance markers are diagnostic blood parameters that indicate impaired histamine metabolism. They are used in laboratory medicine to investigate histamine intolerance.

What Are Histamine Tolerance Markers?

Histamine tolerance markers are laboratory diagnostic parameters used to evaluate histamine intolerance. Histamine intolerance occurs when the body cannot adequately break down histamine absorbed from food, leading to a wide range of symptoms. These markers help assess the biochemical balance between histamine intake and histamine degradation.

Causes of Histamine Intolerance

Histamine is a biogenic amine naturally found in many foods and broken down in the body by the enzyme diamine oxidase (DAO). Histamine intolerance can develop due to:

Reduced activity or genetically determined deficiency of diamine oxidase (DAO)
Excessive intake of histamine-rich foods (e.g., red wine, aged cheese, fish)
Use of medications that inhibit histamine degradation (e.g., certain antibiotics, antidepressants)
Gastrointestinal disorders that impair DAO production
Increased endogenous histamine release due to allergies or mast cell disorders

Key Histamine Tolerance Markers

Diamine Oxidase (DAO) in Serum

Diamine oxidase (DAO) is the primary enzyme responsible for breaking down dietary histamine in the intestine. A low DAO level in the blood is considered the main marker for impaired histamine tolerance. Reference values and cut-off levels may vary between laboratories.

Histamine in Plasma or Whole Blood

Elevated histamine levels in plasma or whole blood can indicate reduced degradation capacity or excessive histamine release. Testing requires careful sample handling, as histamine is highly unstable.

DAO/Histamine Ratio

The ratio of DAO activity to histamine concentration provides a more nuanced assessment than either value alone. An unfavorable ratio suggests an imbalance between histamine intake and breakdown.

Histamine N-Methyltransferase (HNMT)

Histamine N-methyltransferase (HNMT) is another histamine-degrading enzyme that acts primarily intracellularly. Reduced activity of this enzyme can also contribute to histamine overload and is measured in specialized laboratories.

Tryptase

Tryptase is an enzyme released by mast cells. Elevated tryptase levels can indicate mastocytosis or a severe allergic reaction, which must be differentiated from true histamine intolerance.

Total IgE and Specific IgE

Measuring total IgE and specific IgE helps distinguish allergic reactions (e.g., food allergies) from histamine intolerance, as both conditions can cause similar symptoms.

Symptoms of Impaired Histamine Tolerance

Typical complaints that may indicate histamine intolerance include:

Headaches and migraines
Skin reactions such as flushing, itching, and urticaria (hives)
Gastrointestinal complaints (bloating, diarrhea, abdominal pain)
Runny nose and nasal congestion
Palpitations and blood pressure fluctuations
Respiratory symptoms
Fatigue and dizziness

Diagnosis and Test Procedures

The diagnosis of histamine intolerance involves several steps:

Medical history and symptom diary: Recording dietary habits and symptoms
Laboratory testing: Measurement of histamine tolerance markers (especially DAO activity and plasma histamine) from a venous blood sample
Elimination diet: Temporary avoidance of histamine-rich foods to monitor symptoms
Provocation test: Controlled reintroduction of histamine under medical supervision

A definitive diagnosis should always be made by a qualified physician, as laboratory markers alone are not sufficient for a conclusive diagnosis.

Treatment and Therapeutic Approaches

When histamine intolerance is confirmed, several treatment options are available:

Low-histamine diet: Avoidance of histamine-rich foods such as aged cheeses, red wine, canned fish, salami, and sauerkraut
DAO supplementation: Taking diamine oxidase-containing dietary supplements before meals
Antihistamines: Use of antihistamine medications to relieve symptoms
Medication review: Discontinuing or replacing histamine-releasing medications in consultation with a physician
Treatment of underlying conditions: Managing coexisting intestinal disorders that affect DAO levels

References

Maintz L, Novak N. Histamine and histamine intolerance. American Journal of Clinical Nutrition. 2007;85(5):1185-1196.
Reese I et al. Guideline on the diagnosis and management of histamine intolerance. Allergo Journal International. 2017;26(2):72-79.
Schwelberger HG. Histamine intolerance: overestimated or underestimated? Inflammation Research. 2009;58(Suppl 1):51-52.

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