Home
HelpTest ID FRGAM Rheumatoid Factor (RF); IgG, IgA and IgM
Specimen Required
Container/Tube: Red-top tube
Acceptable: SST tube
Specimen Volume: 1.50 mL
Collection Instructions: Draw blood in a plain, red-top tube(s) or a serum-gel tube(s). Spin down and send 1.50 mL of serum refrigerated in a plastic vial.
Method Name
Enzyme Linked Immunosorbent Assay (ELISA)
Reporting Name
Rheumatoid Factor IgG, IgA, IgMSpecimen Type
SerumSpecimen Minimum Volume
0.50 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 5 days | |
| Frozen | 365 days | ||
| Ambient | 5 days |
Reference Values
Rheumatoid Factor (RF) levels IgG:
Negative: <20 EU/mL
Borderline/Equivocal: 20-25 EU/mL
Positive: >25 EU/mL
Rheumatoid Factor (RF) levels IgA:
Negative: <20 EU/mL
Borderline/Equivocal: 20-25 EU/mL
Positive: >25 EU/mL
Rheumatoid Factor (RF) levels IgM:
Negative: <10 IU/mL
Borderline/Equivocal: 10-12.5 IU/mL
Positive: >12.5 IU/mL
Day(s) Performed
Once per week
Report Available
7 to 18 daysPerforming Laboratory
IMMCO Diagnostics, Inc.Test Classification
This test has been developed and performance parameters have been validated by IMMCO Diagnostics, Inc. This test has not been approved by the U.S. Food and Drug Administration (FDA); however, US FDA approval is not required for clinical use. It is not intended that clinical diagnosis and patient management decisions be made using these results alone. This test has been validated using serum samples. The manufacturer has not determined the efficacy of this when performed on CSF, plasma, joint or pleural fluid specimens. The performance characteristics of this test were determined by IMMCO Diagnostics Inc.CPT Code Information
86431 x 3
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FRGAM | Rheumatoid Factor IgG, IgA, IgM | Not Provided |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| Z5623 | Rheumatoid Factor IgG | 33314-6 |
| Z5624 | Rheumatoid Factor IgA | 33313-8 |
| Z5625 | Rheumatoid Factor IgM | 11573-3 |