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Histamine Degradation Profile – Diagnosis and Meaning

The histamine degradation profile evaluates how efficiently the body breaks down histamine. It is a key diagnostic tool for identifying histamine intolerance.

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Things worth knowing about "Histamine Degradation Profile"

The histamine degradation profile evaluates how efficiently the body breaks down histamine. It is a key diagnostic tool for identifying histamine intolerance.

What is the Histamine Degradation Profile?

The histamine degradation profile is a diagnostic assessment that measures the body´s ability to break down histamine, a naturally occurring chemical messenger involved in immune responses, gastric acid secretion, sleep regulation, and vascular function. When the body cannot adequately eliminate histamine, it accumulates in the blood and tissues, potentially triggering a wide range of symptoms.

The profile typically includes the measurement of key histamine-degrading enzyme activities and relevant biomarkers in the blood, providing insight into whether a patient may have histamine intolerance or a related metabolic disorder.

Enzymes Measured in the Profile

Histamine is broken down in the human body by two primary enzyme systems:

Diamine Oxidase (DAO): This enzyme is primarily active in the small intestine and is responsible for degrading dietary histamine. Reduced DAO activity is the most common cause of histamine intolerance.
Histamine N-Methyltransferase (HNMT): This enzyme degrades histamine intracellularly, particularly in the brain and liver, playing a complementary role in histamine metabolism.

The histamine degradation profile may also include the serum or urine histamine level and the ratio of histamine to DAO activity, offering a comprehensive picture of histamine metabolism.

When is the Histamine Degradation Profile Used?

The test is recommended when patients repeatedly experience symptoms associated with histamine intolerance or impaired histamine breakdown, especially following the consumption of histamine-rich foods. Common indications include:

Chronic headaches or migraines
Skin reactions such as flushing, itching, or hives (urticaria)
Gastrointestinal complaints including bloating, diarrhea, or abdominal cramps
Runny nose, sneezing, or nasal congestion without an allergic cause
Heart palpitations or blood pressure drops after eating
Sleep disturbances or fatigue

How is the Test Performed?

The profile is typically performed via a blood draw. The serum or plasma is then analyzed in a laboratory. For accurate DAO measurement, patients are generally advised to avoid histamine-rich foods, alcohol, and DAO-inhibiting medications for 24 to 48 hours prior to the blood draw, as these factors can influence results.

Interpreting the Results

The results of the histamine degradation profile are always interpreted in the context of the patient´s clinical symptoms:

Low DAO activity: Indicates a reduced capacity to break down dietary histamine, which is a strong indicator of histamine intolerance.
Elevated histamine levels: May suggest increased histamine turnover, mast cell activation, or insufficient degradation capacity.
Altered DAO/histamine ratio: An unfavorable ratio between DAO activity and histamine concentration strengthens the suspicion of intolerance.

Important: An abnormal result alone is not sufficient for a definitive diagnosis. Results must always be interpreted alongside the patient's medical history, symptoms, and additional investigations.

Treatment and Therapeutic Options

When reduced histamine degradation capacity is confirmed, several therapeutic approaches are available:

Low-histamine diet: Reducing intake of foods high in histamine, such as aged cheeses, red wine, processed meats, and fermented products.
DAO supplementation: Taking diamine oxidase as a dietary supplement can support the digestion of dietary histamine.
Antihistamines: May be used for short-term relief of acute symptoms.
Treatment of the underlying cause: Intestinal conditions that impair DAO production, such as celiac disease or inflammatory bowel disease, should be addressed directly.
Micronutrient therapy: Vitamin B6, vitamin C, and copper are important cofactors for DAO activity and may be supplemented when deficient.

References

Maintz L, Novak N. Histamine and histamine intolerance. American Journal of Clinical Nutrition. 2007;85(5):1185-1196.
Schwelberger HG. Histamine intolerance: overestimated or underestimated? Inflammation Research. 2009;58(Suppl 1):51-52.
Reese I et al. Guideline of the German Society for Allergology and Clinical Immunology (DGAKI): Approach to suspected intolerance to orally ingested histamine. Allergo Journal International. 2017;26(2):72-79.

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