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Edit Date:1/6/2009
Released:Same day
CPT Code:86762
Specimen Collection Details
Collection:One 7.5 mL serum separator tube (SST). Also acceptable: One 5 mL red top tube.
Handling:Allow to clot, centrifuge and separate serum from cells immediately. Refrigerate. Freeze if specimen cannot be assayed within 48 hours.
Standard Volume:0.5 mL serum.
Minimum Volume:150 µL serum.
Transport:Refrigerated; or if frozen, on dry ice.
Rejection Criteria:Gross hemolysis; gross lipemia; heat treated specimen; specimen frozen and thawed more than three times.
Reference Range:
<10.0 IU/mL

Rubella IgG Quantitative Antibody Result Interpretation, Chemiluminescence Method:
<10.0 IU/mL
Negative: Non-immune, no significant level of detectable Rubella IgG antibody.
10.0-14.9 IU/mL
Equivocal: Repeat testing in 10-14 days may be helpful.
≥ 15.0 IU/mL
Positive: Immune, IgG antibody to Rubella detected, which may indicate a current or previous
exposure/immunization to Rubella.
IU/mL = International Units/mL

Seroconversion between acute and convalescent sera is considered strong evidence of current or recent infection. The best evidence for infection is a significant change on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.