Ordering Recommendation

Refer to aruplab.com/bodyfluids for clinical indications and interpretive information.

New York DOH Approval Status

Testing is not New York state approved. Specimens from New York clients will be sent out to a New York state-approved laboratory.

Specimen Required

Patient Preparation

CSF, Pericardial, Pleural, or Synovial fluid.
New York State Clients: Pericardial fluid requires NY clients to submit a Non-Permitted Laboratory Request (NPL) form to NYSDOH.

Specimen Preparation

Centrifuge to remove cellular material. Transfer 1 mL body fluid to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature


Unacceptable Conditions

Specimen types other than those listed. Specimens too viscous to be aspirated by instrument.


Specimen source must be provided.


Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month (should not be thawed more than once)


Quantitative Immunoturbidimetry




Within 24 hours

Reference Interval

Interpretive Data

For information on body fluid reference ranges and/or interpretive guidance visit https://aruplab.com/bodyfluids/

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
2003348 Rheumatoid Factor, Body Fluid 30231-5
2013048 Rheumatoid Factor Fluid Source 31208-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • RF body fluids
Rheumatoid Factor, Body Fluid