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Aspergillus fumigatus IgG Antibody Test

Published: August 9, 2026Updated: August 17, 2026

Detects IgG antibodies to Aspergillus fumigatus, a fungus commonly found in the environment. Results can help evaluate prior exposure or certain fungal infections.

Quick summary

["A positive result shows Aspergillus-specific IgG antibodies but may not by itself confirm an active infection."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
24162-0
Short code
Deprecated A fumigatus IgG RAST Ql
Synonyms
Deprecated A fumigatus IgG RAST Ql
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This blood test measures IgG antibodies directed against Aspergillus fumigatus, a fungus commonly found in soil, dust, and indoor air. Antibodies develop after the immune system encounters the fungus.

Why might I need this test?

The test may be ordered to help evaluate suspected Aspergillus-related illness, especially in people with chronic lung disease, a weakened immune system, or symptoms such as persistent cough, wheezing, fever, or shortness of breath. It may also be used to investigate unexplained lung findings.

How is the test performed?

A blood sample is collected and examined in the laboratory for Aspergillus fumigatus-specific IgG antibodies. The exact laboratory testing method is not specified by this test listing.

How do I prepare for the test?

No special preparation is usually required for this blood test. Follow any instructions provided by the laboratory or your healthcare professional, particularly if you have a bleeding disorder or are taking anticoagulant medicines.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aspergillus IgG antibody

Frequently asked questions

Does a positive result mean I have an active fungal infection?
Not necessarily. IgG antibodies can remain detectable after previous exposure, so the result must be considered along with symptoms, medical history, imaging, and other tests.
What is Aspergillus fumigatus?
It is a common mold found in soil, dust, and indoor air. Most people are exposed without becoming ill, but certain lung conditions or weakened immunity can increase the risk of disease.
Can this test distinguish colonization from infection?
No. This antibody test alone cannot reliably distinguish harmless colonization from active infection; clinical findings and additional tests are needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy