Rheumatoid Factor

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General Information

Lab Name
Rheumatoid Factor
Lab Code
RF
Epic Ordering
Rheumatoid Factor
Description
Synonyms
Latex, RF

Interpretation

Method
Turbidimetric
Reference Range
Units: IU/mL
Female Male
AgeRangeAgeRange
0-<15 0-<15

Effective date: 01/04/2016

Guidelines

Ordering & Collection

Specimen Type
Blood
Collection
Preferred:  4 mL blood in GOLD SST or LIME GREEN PST tube
Also Acceptable:  4 mL blood in RED TOP, GREEN TOP, or LAVENDER TOP tube
Handling Instructions
The laboratory must process the specimen within 2 hours of collection.
Quantity
requested: 1 mL serum/plasma
minimum: 0.5 mL serum/plasma

Processing

Processing
Separate plasma/serum within 2 hours of collection and refrigerate. Avoid repeated freezing and thawing
 
Stability: Room Temperature: up to 1 day; Refrigerated: 8 days; Frozen at -20°C: 3 months

Performance

LIS Dept Code
Chemistry, Automated Panels (CHA)
Performing Location(s)
UW-MT Chemistry, Automated
206-520-4600

Clinical Lab, Room NW220,
University of Washington Medical Center,
1959 NE Pacific street, Seattle, WA 98195

Frequency
Daily
Available STAT?
No

Billing & Coding

CPT codes
86431
LOINC
11572-5
Interfaced Order Code
UOW2568
Interfaced Result Code
UOW2568