Overview: Measles IgG TestIntroduction: The Measles IgG Test detects measles IgG to confirm immunity or past infection, preventing rash or fever. Aligned with 2023 CDC guidelines, it uses immunoassay for high specificity, supporting infection screening. This test is critical for guiding immunity assessment, vaccination planning, and improving outcomes in serology for patients with suspected measles exposure or vaccination history.
Other Names: Measles IgG Assay, Measles Immunity Test.
FDA Status: Laboratory-developed test (LDT), meeting serology standards for diagnostic accuracy.
Historical Milestone: Measles IgG testing began in the 1960s with vaccine research. Immunoassay methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Detects measles IgG to confirm immunity or past infection, guides vaccination, and evaluates patients with suspected measles exposure.
Test Parameters: 1. Measles IgG Antibodies
Pretest Condition: No fasting required. Collect serum or saliva. Report history of rash, fever, or measles exposure.
Specimen: Serum (SST, 2-5 mL), Saliva (sterile container, 1-2 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document rash, fever, vaccination history, or measles exposure. Include current medications, especially immunosuppressants.
Consent: Written consent required, detailing the tests purpose, measles immunity implications, and risks of blood or saliva collection.
Procedural Considerations: Uses immunoassay to detect measles IgG in serum or saliva. Results are available in 1-2 days, supporting rapid clinical decisions. Performed in laboratories, often for immunity assessment.
Factors Affecting Result Accuracy: Hemolysis, lipemia, or improper sample storage can affect results. Immunosuppression may reduce antibody detection.
Clinical Significance: Positive measles IgG confirms immunity or past infection, guiding vaccination decisions. Negative results may indicate need for vaccination.
Specialist Consultation: Consult an infectious disease specialist or primary care physician for result interpretation and vaccination planning.
Additional Supporting Tests: Measles IgM, PCR, or vaccination records to confirm measles immunity or infection status.
Test Limitations: May not detect recent infection; clinical correlation is needed. Immunosuppression affects results.
References: CDC Measles Guidelines, 2023; Clinical Infectious Diseases, Griffin DE, 2022.
