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Test Code LABRBGG Measles (Rubeola) Antibodies, IgG, Serum

Additional Codes

Test Name in EPIC EPIC Test Code Mnemonic Mayo Test ID
MEASLES (RUBEOLA) AB, IGG, SERUM LABRBGG ROPG ROPG

 

Reporting Name

Measles (Rubeola) Ab, IgG, S

Useful For

Determining immune status of individuals to the measles virus

 

Documenting previous infection with measles virus in an individual without a previous record of immunization to measles virus

Method Name

Multiplex Flow Immunoassay (MFI)

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Ordering Guidance


This assay tests only for IgG-class antibody. For both IgM and IgG antibody testing, see ROGM / Measles (Rubeola) Virus Antibody, IgM and IgG, Serum.



Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Instructions: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Specimen Minimum Volume

0.4 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Frozen  14 days

Reject Due To

Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject
Heat-inactivated specimen Reject

Reference Values

Vaccinated: Positive (≥1.1 antibody index [AI])

Unvaccinated: Negative (≤0.8 AI)

Reference values apply to all ages.

Day(s) Performed

Monday through Saturday

CPT Code Information

86765

LOINC Code Information

Test ID Test Order Name Order LOINC Value
ROPG Measles (Rubeola) Ab, IgG, S 77310-1

 

Result ID Test Result Name Result LOINC Value
ROG Measles (Rubeola) Ab, IgG, S 35275-7
DEXG3 Measles IgG Antibody Index 5244-9

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

Clinical Information

The measles virus is a member of the Paramyxoviridae family of viruses, which includes parainfluenza virus serotypes 1-4, mumps, respiratory syncytial virus (RSV), and metapneumovirus. The measles virus is one of the most highly contagious infectious diseases among unvaccinated individuals and is transmitted through direct contact with aerosolized droplets or other respiratory secretions from infected individuals. Measles has an incubation period of approximately 8 to 12 days, which is followed by a prodromal phase of high fever, cough, coryza, conjunctivitis, and malaise. Koplik spots may also be apparent on the buccal mucosa and can last for 12 to 72 hours.(1,2) Following this phase, a maculopapular, erythematous rash develops beginning behind the ears and on the forehead and spreads centrifugally to involve the trunk and extremities.

 

Immunocompromised individuals, pregnant women, and those with nutritional deficiencies are particularly at risk for serious complications following measles infection, which include pneumonia and central nervous system involvement.(1,3)

 

Following implementation of the national measles vaccination program in 1963, the incidence of measles infection has fallen to fewer than 0.5 cases per 1,000,000 population, and the virus is no longer considered endemic in the United States.(4) Measles outbreaks continue to occur in the United States however, due to exposure of nonimmune individuals or those with waning immunity to infected travelers. The measles outbreak in 2011 throughout Western Europe emphasizes the persistence of the virus in the worldwide population and the continued need for national vaccination programs.(5)

 

The diagnosis of measles infection is often based on clinical presentation alone. Screening for IgG-class antibodies to measles virus will aid in identifying nonimmune individuals.

Interpretation

The reported antibody index (AI) value is for reference only. This is a qualitative test, and the numeric value of the AI is not indicative of the amount of antibody present. AI values above the manufacturer recommended cutoff for this assay indicate that specific antibodies were detected, suggesting prior exposure or vaccination.

 

Positive: AI value of 1.1 or higher

The presence of detectable IgG-class antibodies indicates prior exposure to the measles virus through infection or immunization. Individuals testing positive are considered immune to measles infection.

 

Equivocal: AI value 0.9-1.0

Submit an additional sample for testing in 10 to 14 days to demonstrate IgG seroconversion if recently vaccinated or otherwise clinically indicated.

 

Negative: AI value of 0.8 or lower

The absence of detectable IgG-class antibodies suggests the lack of a specific immune response to immunization or no prior exposure to the measles virus.

Cautions

Immunoglobulin G-class antibodies to measles virus may be present in serum specimens from individuals who have received blood products within the past several months but have not been immunized or experienced past infection with this virus.

 

Serum specimens collected early during acute phase of infection may be negative for IgG-class antibodies to this virus.

Supportive Data

To evaluate the accuracy of the BioPlex Measles IgG multiplex flow immunoassay, 500 prospective serum samples were analyzed in a blinded fashion by the Diamedix Measles IgG EIA (Diamedix) and the BioPlex Measles IgG assay. Samples with discordant results after initial testing were repeated by both assays during the same freeze/thaw cycle. Further discrepancies were evaluated by the SeraQuest Measles IgG EIA (Quest International). The results are summarized in the table below.

 

Table. Comparison between Bioplex and Diamedix Measles Assays

BioPlex Measles IgG

Diamedix Measles IgG EIA

 

Positive

Negative

Equivocal

Positive

420

1(a)

0

Negative

10(b)

27

17

Equivocal

14

0

11

 

(a) This sample tested negative by the SeraQuest Measles IgG EIA

(b) All 10 samples tested positive by the SeraQuest Measles IgG EIA

Sensitivity: 94.6% (420/444); 95% CI: 92.1% to 96.4%

Specificity: 96.4% (27/28); 95% CI: 80.8% to 100.0%

Overall Percent Agreement: 91.6% (458/500); 95% CI: 88.8% to 93.8%

Method Description

The BioPlex 2200 Measles IgG assay uses multiplex flow immunoassay technology. Briefly, serum samples are mixed and incubated at 37° C with sample diluent and dyed beads coated with measles antigen. After a wash cycle, antihuman-IgG antibody conjugated to phycoerythrin (PE) is added to the mixture and incubated at 37° C. Excess conjugate is removed in another wash cycle and the beads are resuspended in wash buffer. The bead mixture then passes through a detector that identifies the bead based on dye fluorescence and determines the amount of antibody captured by the antigen based on the fluorescence of the attached PE. Raw data is calculated in relative fluorescence intensity.

 

Three additional dyed beads, an internal standard bead, a serum verification bead, and a reagent blank bead are present in each reaction mixture to verify detector response, the addition of serum to the reaction vessel, and the absence of significant nonspecific binding in serum.(Package insert: BioPlex 2200 System MMRV IgG, Bio-Rad Laboratories; 02/2019)

Report Available

Same day/1 to 3 days

Specimen Retention Time

14 days

Forms

If not ordering electronically, complete, print, and send Infectious Disease Serology Test Request (T916) with the specimen.