ARUP's Laboratory Test Directory

Rubella Antibody, IgM : 0050551

Mnemonic: RUBEIGM

Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube.

Transport:  1 mL serum at 2-8°C. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport:  0.5 mL serum at 2-8°C.

Remarks:  Allow serum to clot completely at room temperature.  Separate serum from cells ASAP. Acute and convalescent specimens must be labeled as such; parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of acute specimens. Please mark specimen plainly as "acute" or "convalescent."  

Unacceptable Conditions:  Contaminated, heat-inactivated, or hemolyzed specimens.

Stability:  After separation from cells: Ambient: 2 days; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Reference Interval:
0.89 IV or less: Negative - No significant level of detectable rubella IgM antibody.
0.90-1.09 IV: Equivocal - Repeat testing in 10-14 days may be helpful.
1.10 IV or greater: Positive - IgM antibody to rubella detected, which may indicate a current or recent infection or immunization.
Interpretive Data: Testing immediately post-exposure is of no value without a later convalescent specimen. While the presence of IgM antibodies suggests current or recent infection, low levels of IgM antibodies may occasionally persist for more than 12 months post-infection or immunization.
CPT Code(s): 86762
 
 

 

 

 
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