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HelpTest Code RF Rheumatoid Factor
Specimen Requirements
Specimen Type: Serum
Container/Tube: Red Top (Plain)
Volume: 6.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | Not available |
| Refrigerate | 2 days |
| Frozen | 1 month |
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Methodology
Immunoturbidimetry
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
≤ 30 IU/mL
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Diagnosis of rheumatoid arthritis.
Evaluation of ankylosing spondylitis, Sjogren’s syndrome, scleroderma, dermatomyositis, Waldernstrom’s disease and SLE.
Update
Last updated 12/03/2025
Alias
RA Factor
Rheumatoid Arthritis
LOINC Code Information
11572-5
Service Code
31991
Laboratory Code
LAB206