Days Set Up
Monday - Friday
Analytic Time

8 hours

MiChart Code
Rheumatoid Factor
Soft Order Code

Test Updated:


RF Test
Rheumatoid Arthritis
Rheumatoid Factor
SCAT Replacement Assay
Sheep Cell Agglutination Titer Replacement Assay

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology


Test Usage

To determine the presence of 19S gamma globulins directed against IgG Immunoglobulins, to support the diagnosis of rheumatoid arthritis, to evaluate ankylosing spondylitis and sacroilitis. Strong positivity with low ANA usually means rheumatoid arthritis.

Reference Range

< 16 IU/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect specimen in SST tube. Fluids are not acceptable.

Collection Offsite

Collect blood in SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate. Fluids are not acceptable.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.