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Epic Test Code LAB206 Rheumatoid Factor

Performing Location(s)




Specimen Type


Preferred Container

Gold top tube

Alternate Container

Red top tube

Minimum Volume to Submit for Testing

1 mL Serum

  • Multiple test can be performed from this volume. For question please contact the lab at 547-3975.  

Storage Requirements

Sample tubes should be centrifuged within 2 hour of collection followed by transfer of the serum (red or gold top) or plasma (green top) to a labeled plastic, aliquot tube.

See Causes of Rejection for temperature requirements.

Transportation Needs

Deliver specimen to the laboratory within 1 hour of collection. If not possible see “Storage Requirements”

Causes for Rejection

Mislabeled or unlabeled specimen
Less than 50% draw for Vacutainer tubes
> 8 days Refrigerated (Serum tubes are routinely stored at the lab for only 7 days therefore, an add-on may not be possible after 7 days.)
> 24 hours Room Temp
> 3 months Frozen
Hemolysis > 500 mg/dL HgB
Lipemia > 750 mg/dL Trig
Bilirubin > 40 mg/dL Bili

Days of Analysis


Additional Information

Please refer to Rheumatoid Factor Test Change Memo March 25, 2014

Available STAT


Reference Values

Population Units Reference Range
All Populations IU/mL 0 <15

A negative result does not exclude rheumatoid arthritis. Conversely, certain non-rheumatoid 
conditions may elicit a positive results. Interpret in conjunction with other clinical findings.


Although a positive Rheumatoid Factor is highly suggestive of rheumatoid arthritis, it is not diagnostic for this condition since RF also appears in a small percentage of helathy individuals and in some patients with other disorders
Fresh serum is the best specimen type. Although plasma can be used, it is not optimal


Beckman AU/Dx Series

CPT Code


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