Allergy & Intolerance

Histamine blood test without a GP referral

A histamine blood test shows how much histamine is in your blood. Histamine is the substance your body releases during an allergic reaction, mainly from mast cells and basophils. You do not need a referral from your GP, and you do not need to fast.

A test for histamine intolerance is usually the DAO test, not the histamine test. DAO is the enzyme in your gut that breaks down histamine from food. A low DAO is not a diagnosis: the DAO test alone cannot establish histamine intolerance.

A histamine blood test is not the same as the histamine provocation test in hospital. In a provocation test you breathe in histamine, so the doctor can see how sensitive your airways are.

The histamine result is easily disturbed by how the blood is handled, so one high histamine value says little on its own. Less often, a high histamine fits mastocytosis, a rare condition with too many mast cells.

Doctor's Assessment Included

Histamine: what this test measures

This test measures the concentration of histamine in your blood. Histamine is released primarily by mast cells and basophils during immune responses. Plasma histamine has a short half-life, so blood must be processed carefully to avoid false elevations.

Histamine: why this value matters

Measuring blood histamine helps assess mast cell activity. It can support the diagnosis of anaphylaxis, mastocytosis, and histamine-related conditions. Pairing histamine with DAO and tryptase testing provides a more complete picture of histamine metabolism.

Histamine: how the blood test works

Referral: No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw: A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Where: 650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Histamine: when is testing worthwhile?

Histamine testing may be useful if you experience unexplained allergic-type symptoms, suspected anaphylaxis, or symptoms suggestive of mast cell disorders. Blood should ideally be drawn during or shortly after a symptomatic episode. Consult your healthcare provider for timing guidance.

Histamine: symptoms of a high or low value

Low Levels

Low histamine levels are generally considered normal and not associated with specific clinical symptoms.

High Levels

Elevated blood histamine may be associated with flushing, hives, itching, headache, rapid heartbeat, low blood pressure, abdominal cramps, and in severe cases anaphylaxis. Chronic elevation may suggest mastocytosis or histamine intolerance.

Histamine: lifestyle and this value

If histamine-related symptoms are identified, a low-histamine diet may help reduce symptom burden. Keeping a symptom diary helps identify triggers. Antihistamines may be recommended by your healthcare provider. Avoid known triggers and carry emergency medication if prescribed.

Histamine: frequently asked questions

How is blood histamine different from DAO testing?

Blood histamine measures the actual level of histamine in your blood, while DAO measures the enzyme that breaks histamine down. Together they provide a more complete picture of histamine metabolism.

Can certain foods raise blood histamine?

Yes. Histamine-rich foods and histamine-releasing foods can increase blood histamine levels. However, blood histamine testing is usually done to assess mast cell activity rather than dietary histamine.

Why does blood handling matter for this test?

Histamine can be released from blood cells during collection and processing, causing falsely elevated results. Proper sample handling with rapid centrifugation and cooling is essential for accurate results.

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