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Ency. home > Test > R > Rheumatoid factor

Rheumatoid factor   

Overview | Risks | Results

Alternative names:

RF

Definition:

Rheumatoid factor is a test that measures the presence and level of rheumatoid factor (RF) in the blood.

How the Test is Performed

Adult or child:
Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and a tourniquet (an elastic band) or blood pressure cuff is placed around the upper arm to apply pressure and restrict blood flow through the vein.

This causes veins below the tourniquet to distend (fill with blood). A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the tourniquet is removed to restore circulation.

Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.

Infant or young child:
The area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container.

Cotton or a bandage may be applied to the puncture site if there is any continued bleeding.

How to Prepare for the Test

Adults:
No special preparation is usually necessary.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the Test is Performed

The RF test is used mainly in the diagnosis of rheumatoid arthritis, although it can also be positive in many other diseases or healthy people.

The RF is an IgM antibody that recognizes immunoglobulin G (IgG) as an antigen. Antibodies reacting against antigens form immune complexes. These immune complexes can activate the complement system and other inflammatory processes.

About 80% of patients with rheumatoid arthritis have positive RF tests, that is, titers > 1:80 (this means that the sample can be diluted 80 times while still being able to measure the presence of the IgM antibody).

Ency. home > Test > R > Rheumatoid factor

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