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HelpTest Code LAB1234727 Rheumatoid Factors, IgA, IgG, and IgM by ELISA
Performing Laboratory
ARUP Laboratories
Specimen Required
Separate serum from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL)
Specimen Stability Information
Transport: Refrigerated
Stability after separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Day(s) Performed
Performed: Mon, Wed, Fri
Reported: 1-4 days
Method Name
Semi-Quantitative Enzyme-Linked Immunosorbent Assay
CPT Code Information
83516 x3
LOINC Code Information
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0051299 | Rheumatoid Factor, IgG by ELISA | 33314-6 |
| 0051300 | Rheumatoid Factor, IgM by ELISA | 11573-3 |
| 0051301 | Rheumatoid Factor, IgA by ELISA | 33313-8 |
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds
Interpretation
The presence of all three rheumatoid factor (RF) isotypes at abnormal levels has high specificity for a diagnosis of rheumatoid arthritis (RA). However, the presence of RF isotypes in any combination may be found in a variety of conditions, including Sjogren syndrome and hepatitis infections.