South Bend Medical Foundation - Your Community Laboratory

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Test Name:
Rheumatoid Factor IgA, IgG, and IgM, Serum

• SBMF No:
  45363
• Performance Lab Name:
  ARUP Laboratories
• Test Mnemonic:
  RF PAN
• ABN:
  Not required
• CPT Code:
  86430x2; 86431
• LOINC Code:
  33314-6; 11573-3; 33313-8
• Ref Lab Test No:
  0051298
• Test Includes:
  Rheumatoid Factor IgG
  Rheumatoid Factor IgA
  Rheumatoid Factor IgM
• Also Known As:
  RF Isotypes
  RF3
• Also See:
  28019 Rheumatoid Factor, Serum
• Spec Type:
  Serum
• Spec Container:
  Gold top (SST) or red top (serum) tube
• Pref Vol:
  1.0 mL
• Min Vol:
  0.5 mL
• Fasting:
  No
• Spec Collect:
  Routine venipuncture
• Spec Process:
  Clot 30 minutes
  Promptly centrifuge 15 minutes
  Immediately transfer serum to separate plastic tube
• Spec Store Transport:
  Refrigerated
• Spec Stability:
  After separation from cells:
  2 days room temperature (20-30°C)
  2 weeks refrigerated (2-8°C)
  Frozen (-20°C): Unacceptable
• Spec Reject:
  Hemolyzed, lipemic, contaminated, or frozen sample
• Spec Remarks:
  DO NOT FREEZE
• Methodology:
  Enzyme-Linked Immunosorbent Assay (ELISA)
• Clinical Significance:
  Refer to:
  
• Reference Range:
  

  Rheumatoid Factor IgA
  Less than 36 U/mL

  Rheumatoid Factor IgG
  Less than 21 U/mL

  Rheumatoid Factor IgM
  Less than 26 IU/mL

  Interpretive Data:
  The presence of abnormal levels of all three rheumatoid factor (RF) isotypes has a specificity of 99% for RA. However, RF in any isotype combination may be found in hepatitis C, Sjögren's syndrome and other chronic infections.

• Day Run:
  Tue, Thu, Sat
• Time Reported:
  2-5 days
• Test Type:
  IMMUNOLOGY