Histamine blood test
Informed by recognized medical guidance
Overview
A histamine blood test measures the level of histamine in your blood. Histamine is a chemical your body releases during allergic reactions and other immune responses. This test helps doctors check for conditions where histamine levels are too high, such as mast cell disorders or severe allergies.
Key facts
- Histamine is a natural substance in your body that helps fight infections, but too much can cause symptoms like flushing, hives, and stomach pain.
- The test requires a blood sample that must be handled carefully—the tube is often kept cold and processed quickly to get accurate results.
- Results are not a standalone diagnosis; your doctor will consider them alongside your symptoms and other tests.
No, this is not a routine blood test. It is usually done only when a doctor suspects a condition that causes high histamine levels, such as mastocytosis (a rare disorder of mast cells) or severe allergic episodes.
The test may be ordered for people of any age who have unexplained episodes of allergy-like symptoms—especially if they happen without a clear trigger. It is more common in adults with chronic hives or recurrent anaphylaxis and in children with certain genetic mast cell disorders.