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How is rheumatoid factor used to diagnose rheumatoid arthritis?

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Rheumatoid factor is part of the immune system’s overactive response. It shows up in the blood of about 70% to 80% of people with rheumatoid arthritis. High levels of it are linked to more severe cases.

From: What to Know About RA Test Results WebMD Medical Reference

SOURCES:

Arthritis Foundation: "Guide to Lab Tests."

Medline Plus, Medical Encyclopedia: "Rheumatoid Factor."

MedicineNet.com: "Rheumatoid Factor."

University of Maryland Medical Center: "Rheumatoid Arthritis - Diagnosis."

The Johns Hopkins Arthritis Center: "RA and Normal Blood Tests."

Lupus Foundation of America: "The Antinuclear Antibody Test: What It Means."

University of Washington, Department of Orthopedics and Sports Medicine: "Lab Tests."

Reviewed by David Zelman on May 22, 2019

SOURCES:

Arthritis Foundation: "Guide to Lab Tests."

Medline Plus, Medical Encyclopedia: "Rheumatoid Factor."

MedicineNet.com: "Rheumatoid Factor."

University of Maryland Medical Center: "Rheumatoid Arthritis - Diagnosis."

The Johns Hopkins Arthritis Center: "RA and Normal Blood Tests."

Lupus Foundation of America: "The Antinuclear Antibody Test: What It Means."

University of Washington, Department of Orthopedics and Sports Medicine: "Lab Tests."

Reviewed by David Zelman on May 22, 2019

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