Overview: Filaria IgG TestIntroduction: The Filaria IgG Test detects IgG antibodies to filaria, indicating past parasitic infection causing swelling or fever. Following 2023 IDSA guidelines, it uses an immunoassay for high sensitivity, aiding in infectious disease screening. This test is critical for guiding diagnosis, treatment, and improving outcomes in serology for patients with suspected filariasis.
Other Names: Filaria IgG Assay, Filariasis Antibody Test.
FDA Status: Laboratory-developed test (LDT), meeting serology standards for diagnostic accuracy.
Historical Milestone: Filaria antibody testing began in the 1980s with parasitic research. IgG immunoassays emerged in the 1990s, and by the 2000s, high-sensitivity assays improved accuracy.
Purpose: Diagnoses past filarial infection, guides treatment, and monitors IgG antibodies in patients with swelling or fever.
Test Parameters: 1. Filaria IgG
Pretest Condition: No fasting required. Collect serum or saliva at any time. Report symptoms like swelling or fever, and list travel to endemic areas.
Specimen: 2-5 mL serum (SST) or 1-2 mL saliva (sterile container). Centrifuge serum within 1 hour. Transport in a biohazard bag within 8 hours.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document swelling, fever, or travel to filaria-endemic areas. Include current medications, especially antiparasitics.
Consent: Written consent required, detailing the tests purpose, diagnostic implications, and potential need for antiparasitic therapy.
Procedural Considerations: Uses an immunoassay to detect filaria IgG antibodies. Results are available in 1-2 days, enabling rapid clinical decisions.
Factors Affecting Result Accuracy: Cross-reactivity with other parasites may cause false positives. Early infection may cause false negatives.
Clinical Significance: Positive IgG results indicate past filarial infection, guiding monitoring or treatment. Negative results may require antigen or IgM testing.
Specialist Consultation: Consult an infectious disease specialist for result interpretation.
Additional Supporting Tests: Filaria IgM, filaria antigen test, or imaging to confirm filariasis.
Test Limitations: False positives may occur with related parasites. Results require clinical correlation.
References: IDSA Parasitic Guidelines, 2023; Clinical Infectious Diseases, Nutman TB, 2022.
