# Interleukin-4, Plasma

> This test measures the level of Interleukin-4 (IL-4), a protein your immune system releases to regulate inflammation and antibody production. It helps show whether your immune system is reacting in a way typically associated with allergies or asthma. This measurement can help doctors distinguish between different types of immune responses or inflammatory conditions. However, a high or low level does not diagnose a specific illness or identify a specific allergen by itself.

- Labcorp code: 140814
- 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=140814&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.