| Ordering Code | 426 |
|---|---|
| Test Name | Rheumatoid Factor |
| Alias | RF RA Rheumatoid Arthritis |
| Preferred Specimen | Serum |
| Preferred Container | SST (Gold) |
| Other Specimen/Container | Serum in Plain (Red), Plasma in Lithium Heparin (Green-PST), Plasma in Lithium Heparin (Dark Green-PP No Gel) |
| Optimum Volume | 1 mL |
| Transport Requirements | Oahu: Refrigerated Airline: Refrigerated |
| Specimen Stability | Ambient: 1 Day Refrigerated: 8 Days Frozen: 3 Months (Aliquot) (Avoid repeated freezing and thawing) |
| Rejection Criteria | Grossly Hemolyzed, Insufficient quantity, Specimen older than stability limits |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Immunoturbidimetric |
Reference range(s)
The reference ranges listed below are valid on this date of November 22, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Rheumatoid Factor | ALL | <=14 | <=14 | IU/mL |
