# Complement C3a

> This test measures C3a, a small protein fragment released when your immune system is active. It helps show if your body is currently reacting to inflammation or an immune trigger.

- Labcorp code: 004220
- Category: [Immune Regulation](https://picardo.health/labs/tests/immune-regulation.md)
- Sample: blood
- Labcorp turnaround: 4–7 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=004220&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.