# Interleukin-4, Serum

> This test measures the level of Interleukin-4 (IL-4), a protein your immune system uses to send signals between cells. It helps show how your body regulates inflammation and is closely linked to the development of allergies and asthma. Doctors use this measurement to determine if an immune reaction is driven by allergy-related processes rather than other causes. However, this test cannot diagnose a specific condition or identify a specific allergen by itself.

- Labcorp code: 140914
- 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=140914&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.