# Complement C3

> This test measures the level of Complement C3, a protein that helps your immune system fight infections. It helps show if your immune system is currently overactive or being used up too quickly due to inflammation.

- Labcorp code: 006452
- Category: [Immune Regulation](https://picardo.health/labs/tests/immune-regulation.md)
- Sample: blood
- Labcorp turnaround: 1–2 days
- Collection: free at a Labcorp location, or $75.00 at home.
- Without a doctor: yes. People order it themselves, with no doctor's visit or referral.
- Price: shown on the review page its order link opens. Opening it orders nothing.
- Order link: https://app.picardo.health/labs/order?tests=006452&ref=assistant

## About ordering

People order for themselves, with no doctor's visit or referral, and results arrive in their 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.