Test: Mumps Virus Antibody, IgM 
  Synonym: Mumps Virus Serology 
  Method: Enzyme-Linked Immunosorbent Assay 
  Availability: Monday, Wednesday, Friday; results 1 to 6 days 
  Specimen: Blood 
  Collection Device: One 6.0 mL Clot (Red) or one 6.0 mL SST (Gold) tube 
  Volume: 1 - 4 mL blood (0.5 - 2.0 mL serum) 
  Storage/Transport: Separate serum from the cells ASAP. Transport and store refrigerated, and if transport > 48 hours, aliquot and freeze. 
  Unacceptable: Severely lipemic, icteric or hemolyzed samples; heat-activated serum; multiple freeze thaw cycles 
  Specimen Stability: After separation from cells: ambient, < 8 hours; refrigerated, 48 hours; frozen, 1 year 
  Reference Interval: ≤ 0.79 IV: NEGATIVE - No significant level of detectable IgM antibody to Mumps virus
0.80 - 1.20 IV: EQUIVOCAL - Borderline levels of IgM antibody to Mumps virus. Repeat testing in 10-14 days recommended.
≥ 1.21 IV: POSITIVE - Presence of IgM antibody to Mumps virus detected which may indicate a current or recent infection. 
  Reportable Disease: A positive result is reportable 
  Comments: While the presence of IgM antibodies suggests current or recent infection, low levels of IgM antibodies may occasionally persist for > 12 months post infection or immunization. 
  Revised: 7/6/2011