Overview: Scrub Typhus IgG Rapid TestIntroduction: The Scrub Typhus IgG Rapid Test screens scrub typhus IgG to confirm past exposure, preventing complications. Aligned with 2023 IDSA guidelines, it uses rapid immunoassays for high specificity, supporting infection screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in serology for patients with suspected past scrub typhus exposure.
Other Names: Scrub Typhus IgG Rapid Assay, Orientia IgG Rapid Test.
FDA Status: Laboratory-developed test (LDT), meeting serology standards for diagnostic accuracy.
Historical Milestone: Scrub typhus rapid testing began in the 1990s with point-of-care diagnostics. Immunoassay methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Screens scrub typhus IgG to confirm past exposure, guides treatment, and evaluates patients for complications.
Test Parameters: 1. Scrub Typhus IgG Antibodies
Pretest Condition: No fasting required. Collect serum or saliva. Report history of scrub typhus exposure or complications.
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 history of scrub typhus, fever, or complications. Include current medications, especially doxycycline.
Consent: Written consent required, detailing the tests purpose, scrub typhus exposure implications, and risks of sample collection.
Procedural Considerations: Uses rapid immunochromatographic assay to screen scrub typhus IgG. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories or point-of-care settings.
Factors Affecting Result Accuracy: Sample hemolysis or improper storage can affect results. Cross-reactivity with rickettsial infections may reduce specificity.
Clinical Significance: Positive IgG confirms past scrub typhus exposure, guiding preventive measures. Negative results may require confirmatory EIA or PCR.
Specialist Consultation: Consult an infectious disease specialist for result interpretation and treatment planning.
Additional Supporting Tests: Scrub typhus IgM, EIA, or PCR to confirm past exposure.
Test Limitations: Non-specific for certain rickettsial infections; clinical correlation is needed. Sample quality affects sensitivity.
References: IDSA Scrub Typhus Guidelines, 2023; Clinical Infectious Diseases, Varghese GM, 2022.
