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HelpEpic Test Code LAB206 Rheumatoid Factor
Performing Location(s)
BMC
Synonyms
RA, RF
Specimen Type
Serum
Preferred Container
Gold top tube
Alternate Container
Red top tube
Blood Tube Draw Volume
Min 50% draw volume
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 laboratory within 1 hour of collection if unspun. 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
Limitations
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
Reference Values
| Population | Units | Reference Range |
| All Populations | IU/mL | 0 <14 |
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.
Days of Analysis
All
Available STAT
Yes
Additional Information
Please refer to Rheumatoid Factor Test Change Memo March 25, 2014
Methodology
Beckman AU/Dx Series
CPT Code
86431
Last Updated
10-OCT-23 MS