Which statement about a negative RF result is true?

Which statement about a negative RF result is true?

• A. It excludes rheumatic disease
• B. It does not exclude disease
• C. It confirms RA
• D. It rules out other diseases

Answer: (B)

A negative RF result does not exclude disease. Rheumatoid factor is not perfectly sensitive or specific for rheumatoid disease—some people with rheumatoid arthritis are seronegative, especially early in the disease, and RF can be absent even when disease is present. RF can also be positive in other conditions or in healthy individuals, so a negative test cannot definitively rule out RA or other rheumatic diseases. In practice, clinicians interpret a negative RF alongside clinical features and often rely on additional tests, like anti-CCP antibodies, imaging, and symptom assessment, to make a diagnosis.

A negative RF result does not exclude disease. Rheumatoid factor is not perfectly sensitive or specific for rheumatoid disease—some people with rheumatoid arthritis are seronegative, especially early in the disease, and RF can be absent even when disease is present. RF can also be positive in other conditions or in healthy individuals, so a negative test cannot definitively rule out RA or other rheumatic diseases. In practice, clinicians interpret a negative RF alongside clinical features and often rely on additional tests, like anti-CCP antibodies, imaging, and symptom assessment, to make a diagnosis.