# Immunoglobulin G, Subclasses (1-4)

> This test measures the levels of four specific types of Immunoglobulin G (IgG), which are antibodies your immune system uses to fight infections. It helps show if your body is making enough of each specific antibody type to protect you against bacteria and viruses, which is often checked when a person has frequent infections. This information helps doctors look for specific weaknesses in your immune system's defense. However, this test does not diagnose allergies or identify the specific germ causing a current illness.

- Labcorp code: 209601
- Category: [Immune Regulation](https://app.picardo.health/labs/tests/immune-regulation.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=209601&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.