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Rheumatoid Factor
Access Labcorp Draw · Access Medical Labs · Quest Diagnostics3 test optionsFrom $14.45
Rheumatoid Factor
Access Labcorp Draw · Access Medical Labs · Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
DetailsRheumatoid Factor – This test measures the level of Rheumatoid Factor (RF) in your blood, which can help in diagnosing conditions like rheumatoid arthritis and other autoimmune diseases. Elevated RF levels can be found in various conditions, including SLE (Systemic Lupus Erythematosus), scleroderma, Sjogren's syndrome, and diseases like leprosy, tuberculosis, syphilis, as well as in thyroid disease, certain cancers, and even in some healthy elderly people.
What patients is this test right for?This test may be recommended if you have symptoms that suggest rheumatoid arthritis or other autoimmune conditions, such as:
• Joint pain and swelling
• Stiffness, especially in the morning
• Chronic dry eyes or mouth
• Skin thickening or rashes
• Unexplained fever
What type of sample is required for this test?1 mL serum. A simple blood draw is needed.
Additional test information
This test measures the level of Rheumatoid Factor (RF) in the blood, which can help in diagnosing conditions like rheumatoid arthritis and other autoimmune diseases.
Collection and processing
- Sample type: Serum
- Fasting: No
- Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Related Sunridge care
Learn how Sunridge approaches Autoimmune Diseases and ask whether this test is appropriate for your clinical question.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Serum. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: No. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should be available in 2 – 5 business days after the sample is collected. Timing can change after collection or if a laboratory requires additional review.
About this test
DetailsRheumatoid Factor - This test measures the level of Rheumatoid Factor (RF) in your blood, which can help in diagnosing conditions like rheumatoid arthritis and other autoimmune diseases. Elevated RF levels can be found in various conditions, including SLE (Systemic Lupus Erythematosus), scleroderma, Sjogren's syndrome, and diseases like leprosy, tuberculosis, syphilis, as well as in thyroid disease, certain cancers, and even in some healthy elderly people.
What patients is this test right for?This test may be recommended if you have symptoms that suggest rheumatoid arthritis or other autoimmune conditions, such as:
• Joint pain and swelling
• Stiffness, especially in the morning
• Chronic dry eyes or mouth
• Skin thickening or rashes
• Unexplained fever
What type of sample is required for this test?1 mL serum. A simple blood draw is needed.
Additional details
This test measures the level of Rheumatoid Factor (RF) in the blood, which can help in diagnosing conditions like rheumatoid arthritis and other autoimmune diseases.
Highlighted health areas
- Autoimmune
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Rheumatoid factor