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Histamine Absorption Marker – Meaning & Diagnostics

Histamine absorption markers are diagnostic parameters that indicate the uptake of histamine in the gut and are used in the evaluation of histamine intolerance.

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Histamine absorption markers are diagnostic parameters that indicate the uptake of histamine in the gut and are used in the evaluation of histamine intolerance.

What Are Histamine Absorption Markers?

Histamine absorption markers are laboratory diagnostic values that provide information about the absorption (uptake) of histamine from the gastrointestinal tract into the bloodstream. They are primarily used in the diagnosis of histamine intolerance (HIT). When histamine absorption or degradation is impaired, excessive reactions can occur in the body, manifesting as a wide range of symptoms.

Background: Histamine and Its Significance

Histamine is a biogenic amine that acts as a messenger substance (mediator) in the body. It is naturally present in many foods and is also produced endogenously. Under normal circumstances, absorbed histamine is broken down by specific enzymes – primarily diamine oxidase (DAO) and histamine-N-methyltransferase (HNMT). If the activity of these enzymes is reduced or if excessive amounts of histamine are ingested, histamine intolerance can develop.

Which Markers Are Measured?

Diamine Oxidase (DAO)

DAO is the most important enzyme for breaking down histamine in the gut and bloodstream. A low DAO level in blood serum is considered an important indicator of impaired histamine absorption or degradation. DAO activity is frequently measured as the primary histamine absorption marker.

Histamine in Blood and Urine

The direct detection of elevated histamine in plasma or urine can also serve as a marker for impaired absorption or breakdown. Elevated values indicate an excessive histamine burden in the body.

Histamine-N-Methyltransferase (HNMT)

HNMT is another histamine-degrading enzyme that acts primarily intracellularly. Genetic variants (polymorphisms) of this enzyme can affect histamine tolerance and are investigated in specialized laboratories.

DAO/Histamine Ratio

The ratio between DAO activity and measured histamine levels (DAO/histamine ratio) provides additional diagnostic information about the balance between histamine uptake and degradation.

Clinical Significance and Diagnosis

Histamine absorption markers are used when histamine intolerance is suspected, particularly in patients who develop typical symptoms after consuming histamine-rich foods (e.g., aged cheese, red wine, canned fish). Common symptoms include:

Headaches and migraines
Skin reactions such as redness, itching, or hives
Gastrointestinal complaints (bloating, diarrhea, abdominal pain)
Rapid heartbeat and low blood pressure
Runny nose and mucosal swelling

Histamine absorption markers are typically determined from a blood sample (serum or plasma). A low DAO value alone is considered an indicator but is not sufficient for a confirmed diagnosis by itself. Results must always be interpreted in the clinical context, together with the patient's medical history and a nutritional assessment.

Treatment and Management

If abnormal histamine absorption markers are identified, therapeutic options include:

Low-histamine diet: Reduction of histamine-rich and histamine-releasing foods
DAO supplementation: Taking DAO-containing dietary supplements to support histamine breakdown
Antihistamines: Medications that block the effects of histamine at its receptors
Avoidance of DAO inhibitors: Certain medications and alcohol inhibit DAO activity and should be avoided

References

Maintz L, Novak N. Histamine and histamine intolerance. American Journal of Clinical Nutrition, 2007; 85(5): 1185–1196. DOI: 10.1093/ajcn/85.5.1185
Reese I et al. Guideline on the management of suspected intolerance to orally ingested histamine. Allergologie, 2017; 40(5): 229–238.
Schwelberger HG. Histamine intolerance: overestimated or underestimated? Inflammation Research, 2009; 58(Suppl 1): 51–52. DOI: 10.1007/s00011-008-0065-8

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