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HelpTest Code RFPN Rheumatoid Factor Panel, Serum
Additional Testing Requirements
Rheumatoid factor (RF) IgA and RF IgM should be tested in combination with CCP / Cyclic Citrullinated Peptide Antibodies, IgG, Serum; or following positive or equivocal results for either RHUT / Rheumatoid Factor, Serum; or RAPAN / Rheumatoid Arthritis Panel, Serum.
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into plastic vial.
Useful For
Evaluating patients at-risk of rheumatoid arthritis (RA) or features of inflammatory arthritis
Differentiating the antibody isotype profile in patients positive for rheumatoid factor (RF)
Aid in the risk stratification of RF-seropositive patients with RA
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| RFA | Rheumatoid Factor IgA, S | No | Yes |
| RFM | Rheumatoid Factor IgM, S | No | Yes |
Reporting Name
Rheumatoid Factor Panel, SSpecimen Type
SerumSpecimen Minimum Volume
0.3 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 28 days | ||
| Ambient | 48 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
| Heat-treated specimens | Reject |
Reference Values
RHEUMATOID FACTOR, IgA
Negative: <20 CU
Positive: ≥20 CU
Reference values apply to all ages.
RHEUMATOID FACTOR, IgM
Negative: <5.0 IU/mL
Positive: ≥5.0 IU/mL
Reference values apply to all ages.
Day(s) Performed
Wednesday
Report Available
2 to 7 daysSpecimen Retention Time
14 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
86431 x2
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RFPN | Rheumatoid Factor Panel, S | 106053-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| RFM | Rheumatoid Factor IgM, S | 9338-5 |
| RFA | Rheumatoid Factor IgA, S | 33313-8 |