Overview: Aspergillus IgG TestIntroduction: The Aspergillus IgG Test detects Aspergillus-specific IgG to diagnose aspergillosis, causing lung infections or fever. Aligned with 2023 IDSA guidelines, it uses immunoassay for high specificity, supporting infection screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in serology for patients with suspected chronic aspergillosis or allergic bronchopulmonary aspergillosis.
Other Names: Aspergillus IgG Assay, Fungal Antibody Test.
FDA Status: Laboratory-developed test (LDT), meeting serology standards for diagnostic accuracy.
Historical Milestone: Aspergillus IgG testing began in the 1980s with fungal research. Immunoassay methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Detects Aspergillus IgG to diagnose aspergillosis, guides treatment, and evaluates patients with lung infections or fever.
Test Parameters: 1. Aspergillus Specific IgG
Pretest Condition: No fasting required. Collect serum or saliva. Report history of lung infections, fever, or fungal 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 lung infections, fever, cough, or history of fungal exposure. Include current medications, especially antifungals.
Consent: Written consent required, detailing the tests purpose, aspergillosis implications, and risks of sample collection.
Procedural Considerations: Uses immunoassay to detect Aspergillus-specific IgG in serum or saliva. Results are available in 1-2 days, supporting rapid clinical decisions. Performed in laboratories, often for aspergillosis diagnosis.
Factors Affecting Result Accuracy: Hemolysis, lipemia, or improper sample storage can affect results. Immunosuppression may reduce antibody detection.
Clinical Significance: Positive Aspergillus IgG suggests chronic aspergillosis or ABPA, guiding antifungal therapy (e.g., itraconazole). Negative results may require further testing.
Specialist Consultation: Consult an infectious disease specialist or pulmonologist for result interpretation and treatment planning.
Additional Supporting Tests: Galactomannan antigen, fungal culture, or chest CT to confirm aspergillosis diagnosis.
Test Limitations: May not detect acute infection; clinical correlation is needed. Cross-reactivity with other fungi may occur.
References: IDSA Aspergillosis Guidelines, 2023; Clinical Infectious Diseases, Patterson TF, 2022.
