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HelpTest Code RF Rheumatoid Factor
Laboratory Code
LAB206
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 |
Methodology
Immunoturbidimetry
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
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
LOINC Code Information
11572-5
Alias
RA Factor
Rheumatoid Arthritis
Update
Last updated 12/03/2025