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Test Name:
California Encephalitis IgM Antibody, by IFA, Serum


  • SBMF No:
    45473
  • Performance Lab Name:
    ARUP Laboratories
  • Test Mnemonic:
    CALIF IGM
  • ABN:
    Not required
  • CPT Code:
    86651
  • LOINC Code:
    10905-8
  • Ref Lab Test No:
    0098731
  • Also Known As:
    Encephalitis Antibody, California, IgM
    CE IgM Ab
    La Crosse Encephalitis IgM Antibody
  • Also See:
    45476 Eastern Equine Encephalitis IgM Antibody, Serum
    45479 St. Louis Encephalitis IgM Antibody, Serum
    28239 West Nile Virus IgM Antibody, Serum
    45482 Western Equine Encephalitis IgM Antibody, Serum
  • Spec Type:
    Serum
  • Spec Container:
    Gold top (SST) or red top (serum) tube
  • Pref Vol:
    1.0 mL
  • Min Vol:
    0.5 mL
    Pediatric Collection: 0.15 mL
  • Fasting:
    No
  • Spec Collect:
    Routine venipuncture
    Parallel testing is preferred
    Label samples as: "acute" or "convalescent"
    Convalescent samples must be received within 30 days from receipt of acute samples
  • 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:
    48 hours room temperature (20-30°C)
    2 weeks refrigerated (2-8°C)
    1 year frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles
  • Spec Reject:
    Plasma, heat-inactivated, severely lipemic, contaminated, or hemolyzed sample
  • Methodology:
    Indirect Fluorescent Antibody (IFA)
  • Clinical Significance:
    Refer to:
    ARUP Consult | The Physician's Guide to Laboratory Test Selection and Interpretation
  • Reference Range:
    California Encephalitis Antibody, IgM by IFA, Serum
    Less than 1:16
    Interpretive Data:
    This test is intended to be used as a semi-quantitative means of detecting California Encephalitis Group virus-specific IgM in serum samples in which there is a clinical suspicion of California Encephalitis Group virus infection. A positive result for IgM may suggest current or recent infection. This test should not be used solely for quantitative purposes, nor should the results be used without correlation to clinical history or other data. LaCross virus is related within the California Encephalitis Group and generally is reactive with antibody to other viruses within this group.
  • Day Run:
    Tue, Fri
  • Time Reported:
    2-6 days
  • Test Type:
    INFECTIOUS ANTIBODY