LabInformationLab tests, explained

Rheumatoid Factor (RA) Test in California

This page explains the rheumatoid factor (ra) test, what it measures, and how to arrange it. The rheumatoid factor (RF) test checks for an antibody that can be present in autoimmune conditions, especially rheumatoid arthritis. It is ordered when a person has joint pain, swelling, or stiffness that might be due to an autoimmune disease. California residents in Pacific can request the rheumatoid factor (ra) test online and choose a convenient collection point.

Sample type
blood
Category
Autoimmune
Turnaround
1-3 business days
Price
$198
Referral
Not required

The rheumatoid factor (RF) test checks for an antibody that can be present in autoimmune conditions, especially rheumatoid arthritis. It is ordered when a person has joint pain, swelling, or stiffness that might be due to an autoimmune disease.

What it measures

  • Rheumatoid factor (RF) — An antibody that may be elevated in rheumatoid arthritis and other conditions.
  • RF titer — A measure of how much RF is present, reported as a number or dilution.
  • Isotype (IgM, IgG, IgA) — Some tests specify which type of RF antibody is present.

Who it is for

A primary care doctor or rheumatologist typically orders this test when evaluating joint symptoms or suspected autoimmune disease.

Preparation

No fasting or special preparation is usually needed for the rheumatoid factor test.

Results and what they mean

Results are reported as a value with a reference range, often as negative or positive. A positive result does not confirm a diagnosis, and a negative result does not rule it out. Only a clinician can interpret your results in the context of your symptoms and other tests. This is general information, not medical advice.

Requesting the Rheumatoid Factor (RA) Test in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. Access across Pacific is uneven, so confirming a site ahead of time is worthwhile.

Frequently asked questions

What does a positive rheumatoid factor test mean?

It means the antibody was found in your blood. It can occur in rheumatoid arthritis and other conditions, so your doctor will consider your symptoms and other tests.

Can I have rheumatoid arthritis with a negative test?

Yes. Some people with rheumatoid arthritis do not have a positive rheumatoid factor test, so doctors may order other tests.

Do I need to fast for this test?

No, fasting is not required for the rheumatoid factor test.

How long does it take to get results?

Results are typically available within 1 to 3 business days.

Rheumatoid Factor (RA) Test by city in California

All testing in California →   Full Rheumatoid Factor (RA) Test guide →