Oral Histamine Challenge Test (Serum)

What to Expect Before the Test

You’ll start with a baseline blood draw before consuming a histamine-containing food or supplement (e.g., aged cheese, wine, or a prescribed dose). Afterward, blood samples are taken at intervals to monitor your histamine levels and symptoms like flushing, nausea, or itching.

How the Test Works

Your blood is analyzed for histamine and related metabolites (like methylhistamine) to assess how your body processes and reacts to histamine. Some tests may also measure other biomarkers like tryptase, which can indicate inflammation or allergy activity.

Common Causes and Conditions

This test is often used for patients suspected of having histamine intolerance or food allergies, particularly if symptoms like headaches, digestive issues, or skin reactions occur after consuming certain foods.

Clinical Significance

Elevated histamine or metabolite levels after ingestion can confirm a histamine-related disorder. However, results alone may not diagnose the condition without correlating with patient symptoms and dietary triggers.