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Rheumatoid factor (RF or RhF) is a blood test performed in patients with suspected rheumatoid arthritis (RA). It is an auto-antibody directed against the Fc portion of IgG, which is itself an antibody. RF and IgG form immune complexes, which are part of the disease process (serum sickness) of various rheumatological diseases. Storage/Transport Temperature: 1 mL plasma or serum, 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Amber Transport Tube. Rheumatoid factor can also be a cryoglobulin (antibody that precipitates on cooling of a blood sample); it can be either type 2 (monoclonal IgM to polyclonal IgG) or 3 (polyclonal IgM to polyclonal IgG) cryoglobulin. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See for details. Source: Wikipedia, Rheumatoid factor (Wikipedia)

Antibodies found in adult rheumatoid arthritis patients that are directed against gamma-chain immunoglobulins. Source: National Library of Medicine, MeSH 2006

Basic Part Properties

Part Display Name
Rheumatoid factor
Part Type
Component (Describes the core component or analyte measured)
Created On
Construct for LOINC Short Name
Rheumatoid fact

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Language Variants Get Info

Tag Language Translation
zh-CN Chinese (China) 类风湿因子
Synonyms: RF;Rheumatoid Factor
fr-CA French (Canada) Facteur rhumatoïde
et-EE Estonian (Estonia) Reumatoidfaktor
es-ES Spanish (Spain) Factor Reumatoide
it-IT Italian (Italy) Fattore reumatoide
Synonyms: FR
el-GR Greek (Greece) Ρευματοειδής παράγοντας
Synonyms: RF
tr-TR Turkish (Turkey) Romatoid faktör
ru-RU Russian (Russian Federation) Ревматоидный фактор
nl-NL Dutch (Netherlands) reumafactor
fr-BE French (Belgium) Facteur rhumatoïde
Synonyms: RF
pl-PL Polish (Poland) Czynnik reumatoidalny