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Measles Ab, IgG
Test CodeMEASG
Alias/See Also
Rubeola, Measles
CPT Codes
86765
Preferred Specimen
GOLD (SST)
Other Acceptable Specimens
Red
Only Serum is acceptable
Only Serum is acceptable
Instructions
- Collect 1 gold topped, serum separator tube. No anticoagulants or preservatives should be added.
- Allow tubes to clot adequately before centrifugation.
- Avoid using hemolyzed, lipemic, or bacterially contaminated sera
Specimen Stability
- Eight (8) hours at room temperature.
- Forty eight (48) hours at refrigerator temperature 2° and 8°C degrees.
- If delay in testing is beyond 48 hours, store test sera at -20°C or lower. Avoid multiple freeze/thaw cycles that may cause loss of antibody activity and give erroneous results.
Reference Range
Index Value for Measles Ab, IgG:
The results of this test system are qualitative. The magnitude of the ratio for positive specimens may not correlate with antibody titer. If testing a particular sample occurs early during primary infection, no detectable IgG may be evident. If Measles infection is suspected, a second sample should be taken at least fourteen days later.
- Negative: 0.89 IV or less: Indicates no detectable IgG antibodies to measles. No current or previous infection with Measles. Patient is presumed to be non-immune and are therefore susceptible to a primary infection.
- Equivocal: 0.90 - 1.09 IV: Specimens with OD ratio values in the equivocal range should be re-tested in a few weeks or by an alternate serologic method.
- Positive: Greater 1.10 IV: Indicates a past or current infection with Measles and that the patient should be considered immune to Measles primary infection.
The results of this test system are qualitative. The magnitude of the ratio for positive specimens may not correlate with antibody titer. If testing a particular sample occurs early during primary infection, no detectable IgG may be evident. If Measles infection is suspected, a second sample should be taken at least fourteen days later.
Clinical Significance
The results of this test, together with other clinical information, may aid in the determination of immune status, and/or aid in the diagnosis of Measles infections.
Performing Laboratory
CRMC Microbiology/Immunology Laboratory
