Rheumatoid Factor IgM, IgG & IgA
Test Mnemonic
RHEUMA
CPT Codes
- 83516 - QTY (3)
- 86431 - QTY (1)
Includes
- Rheumatoid Factor IgG
- Rheumatoid Factor IgM
- Rheumatoid Factor IgA
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Serum | SST (Gold) | Refrigerated | Separate serum from cells ASAP or within 2 hours of collection. Transfer serum to standard aliquot tube. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.3 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | After separation from cells: 2 days |
| Refrigerated | After separation from cells: 2 weeks |
| Frozen | After separation from cells: 1 year |
Days Performed
Mon, Wed, Fri
Turnaround Time
2 - 5 days
Methodology
| Name | Description |
|---|---|
| Semi Quantitative Enzyme Linked Immunosorbent Assay |
Reference Range
| Rheumatoid Factor IgA | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Years | 99 Years | Normal | < = 6 | Units | |
| Rheumatoid Factor IgG | |||||
| Sex | Age From | Age To | Type | Range | Range Unit |
| Years | 99 Years | Normal | < = 6 | Units | |
| Rheumatoid Factor IgM | |||||
| Sex | Age From | Age To | Type | Range | Range Unit |
| Years | 99 Years | Normal | < = 6 | Units |
Special Info
Contaminated, hemolyzed, icteric, or lipemic specimens are unacceptable. This test is New York DOH approved.
Clinical Info
The presence of all three rheumatoid factor (RF) isotopes at abnormal levels has high specificity for a diagnosis of rheumatoid arthritis (RA). However, the presence of RF isotopes in any combination may be found in a variety of conditions, including Sjogren syndrome and hepatitis infections.