Test Id : ROPG
Measles (Rubeola) Antibodies, IgG, Serum
Useful For
Suggests clinical disorders or settings where the test may be helpful
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
A short description of the method used to perform the test
Multiplex Flow Immunoassay
NY State Available
Indicates the status of NY State approval and if the test is orderable for NY State clients.
Reporting Name
Lists a shorter or abbreviated version of the Published Name for a test
Aliases
Lists additional common names for a test, as an aid in searching
Measles Virus
Rubeola Ab, IgG
Rubeola Antibodies, IgG Only
Rubeola IgG Antibody
Specimen Type
Describes the specimen type validated for testing
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
Defines the optimal specimen required to perform the test and the preferred volume to complete testing
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.
Forms
If not ordering electronically, complete, print, and send Infectious Disease Serology Test Request (T916)
Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the testing laboratory. The minimum volume is sufficient for one attempt at testing.
0.4 mL
Reject Due To
Identifies specimen types and conditions that may cause the specimen to be rejected
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
| Heat-inactivated specimen | Reject |
Specimen Stability Information
Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 14 days |
Useful For
Suggests clinical disorders or settings where the test may be helpful
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
Clinical Information
Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
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.
Reference Values
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Vaccinated: Positive (> or =1.1 antibody index [AI])
Unvaccinated: Negative (< or =0.8 AI)
Reference values apply to all ages.
Interpretation
Provides information to assist in interpretation of the test results
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
Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances
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%
Clinical Reference
Recommendations for in-depth reading of a clinical nature
1. Perry RT, Halsey NA. The clinical significance of measles-a review. J Infect Dis. 2004;189 Supp 1:S4-S16. doi:10.1086/377712
2. Babbott FL, Gordon JE: Modern measles. Am J Med Sci. 1954;228(3):334-361
3. Liebert UG. Measles virus infections of the central nervous system. Intervirology. 1997;40(2-3):176-184
4. Centers for Disease Control and Prevention (CDC). Measles-United States, 1999. MMWR Morb Mortal Wkly Rep. 2000;49(25):557-560
5. Centers for Disease Control and Prevention (CDC). Increased transmission and outbreaks of measles-European Region, 2011. MMWR Morb Mortal Wkly Rep. 2011;60(47):1605-1610
6. Theel ES, Sorenson M, Rahman C, Granger D, Vaughn A, Breeher L. Performance characteristics of a multiplex flow immunoassay for detection of IgG-Class antibodies to measles, mumps, rubella, and Varicella-Zoster viruses in presumptively immune health care workers. J Clin Microbiol. 2020;58(4):e00136-20. doi:10.1128/JCM.00136-20
Method Description
Describes how the test is performed and provides a method-specific reference
The BioPlex 2200 Measles IgG assay uses multiplex flow immunoassay technology. Briefly, serum samples are mixed and incubated at 37 degrees 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 degrees 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)
PDF Report
Indicates whether the report includes an additional document with charts, images or other enriched information
Day(s) Performed
Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.
Monday through Friday
Report Available
The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.
Specimen Retention Time
Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
Performing Laboratory Location
Indicates the location of the laboratory that performs the test
Fees :
Several factors determine the fee charged to perform a test. Contact your U.S. or International Regional Manager for information about establishing a fee schedule or to learn more about resources to optimize test selection.
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Test Classification
Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) product.
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.
CPT Code Information
Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
CPT codes are provided by the performing laboratory.
CPT codes are provided by the performing laboratory.
86765
LOINC® Information
Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and results codes of this test. LOINC values are provided by the performing laboratory.
| Test Id | Test Order Name | Order LOINC Value |
|---|---|---|
| ROPG | Measles (Rubeola) Ab, IgG, S | 77310-1 |
| Result Id | Test Result Name |
Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
|
|---|---|---|
| ROG | Measles (Rubeola) Ab, IgG, S | 35275-7 |
| DEXG3 | Measles IgG Antibody Index | 5244-9 |