ARUP's Laboratory Test Directory
| 0050551: Rubella Antibody, IgM |
| Test Mnemonic: RUBEIGM | |
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Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat Reported: Within 24 hours |
| Specimen Required: | |
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Collect: One 4 mL SST.
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) |
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| Reference Interval: |
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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: | |
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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.
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| CPT Code(s): | |
| 86762 |