Rheumatoid Factor (RA), Quantitative Report Format
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What is the RA Factor Test?
The Rheumatoid Factor (RA) test detects the presence and quantity of autoantibodies that may attack healthy joints. It is primarily used to support the diagnosis of rheumatoid arthritis and other autoimmune conditions.
What is a Quantitative RA Report Format?
A quantitative RA report provides a numeric measurement of rheumatoid factor in the blood, helping gauge the severity of autoimmune activity and aiding in diagnosis.
Tests Included in RA (Quantitative) Report
Test | Description |
Rheumatoid Factor (RA), Quantitative | Measures the concentration of RA antibodies in IU/mL to assess autoimmune inflammation. |
Key Parts of an RA Report
Key Part | Description |
Sample Type | Serum (blood sample). |
Test Method | Nephelometry or ELISA-based assay. |
Measured Value | RA factor reported in IU/mL. |
Reference Range | Indicates what’s considered normal or elevated. |
Interpretation | Clinical explanation based on test results. |
Normal Range for RA (Quantitative) Report
RA Factor | Reference Range (IU/mL) |
Normal | <14 IU/mL |
Borderline | 14–20 IU/mL |
Elevated | >20 IU/mL |
Parameters to Consider in RA Report
Parameter | Interpretation |
Mild Elevation | May be seen in early or mild autoimmune activity. |
High Levels | Strongly suggestive of rheumatoid arthritis or other autoimmune diseases. |
False Positives | May occur in chronic infections, aging, or other inflammatory conditions. |
Clinical Correlation | Always interpret with symptoms, CRP, ESR, and anti-CCP antibody. |
Guidelines for RA Report Format
Guideline | Description |
Confirmatory Use | RA factor supports but does not confirm the diagnosis alone. |
Serial Monitoring | Repeat testing may help monitor disease progression or response to therapy. |
Age Consideration | Slight increases in older adults may not always indicate disease. |
What Do the Results Mean?
Result Type | Interpretation |
Negative | RA factor not elevated—does not rule out RA. |
Borderline | Requires further testing (anti-CCP, imaging, symptoms). |
Positive | May support the diagnosis of RA—especially if accompanied by joint symptoms. |
Rheumatoid Factor (RA) Report Interpretation
Test | Interpretation |
RA Factor (Quantitative) | Measures autoimmune antibody level to assess potential rheumatoid arthritis, requiring clinical and lab correlation for accurate diagnosis. |
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