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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.
Service Code
31991
Update
Last updated 12/03/2025
Laboratory Code
LAB206
LOINC Code Information
11572-5
Alias
RA Factor
Rheumatoid Arthritis