# Rheumatoid Factor (RF)

> This test measures the level of rheumatoid factor, a protein produced by your immune system that can mistakenly attack healthy body tissue. It helps show whether symptoms like joint pain, stiffness, or swelling may be caused by an autoimmune reaction rather than general wear and tear.

- Labcorp code: 006502
- Category: [Autoimmunity](https://picardo.health/labs/tests/autoimmunity.md)
- Sample: blood
- Labcorp turnaround: within 1 day
- 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=006502&ref=assistant
- Already in these panels: [Thyroid & Autoimmunity](https://picardo.health/labs/panels/thyroid-autoimmunity.md)

## 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.