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Rheumatoid Factor


Rheumatoid Factor
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Reference Range:

Negative: 0 - 15 IU/ml
Positive: > 15 IU/ml

Turnaround Time:

3 working days


Internal Test Code:- RF


Indication: Investigation of inflammatory arthritis

Background: Rheumatoid factor may be found in Rheumatoid arthritis, Sjogren's Syndrome and other connective tissue diseases. It is also found in up to 10% of normals and up to 50% of patients with infections. Please interpret with clinical findings and inflammatory indices.

Method: Nephelometry

Repeat Frequency: As clinically indicated.



Vessels and Containers:

Serum gold-top

Sample Requirements:

500µl serum


No interference with the determinations in serum was detected for concentrations of triglycerides up to 19 g/L, bilirubin at 600 mg/L, and free haemoglobin at 10 g/L.

How result is reported:

Numeric in IU/ml

Important Information:

Entry Last Modified: 09/07/2019

Transportation and Handling:

At room temperature

Special Precautions:


Time limits for requesting additional examinations:

Sample available in this laboratory for approximately 2 weeks. Test can only be added to samples already received by Immunology.