# Histamine Determination, Urine

> This test measures the amount of histamine in your urine, a chemical released by your immune system during allergic reactions. It helps doctors evaluate symptoms like unexplained flushing, itching, or sudden drops in blood pressure that suggest your body is producing too much histamine. This measurement helps show whether you may have a disorder involving overactive mast cells, such as systemic mastocytosis. However, this test alone cannot determine the specific trigger of an allergic reaction or diagnose the underlying cause without additional exams.

- Labcorp code: 144618
- Category: [Allergies & Sensitivities](https://app.picardo.health/labs/tests/allergies-sensitivities.md)
- Price: shown at checkout, before payment.
- Blood draw: free at a Labcorp location, or $75.00 at home.
- Order link: https://app.picardo.health/labs/order?tests=144618&ref=assistant

## About ordering

A licensed physician reviews every order before any test is run, and results arrive in the person's Picardo account. Ordering is open to adults 18 and over in the US, except New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii and Maine. General health information, not medical advice.